Czech Journal of Animal Science - Latest articles

Evaluation of weaning diets for sustainable indoor largemouth bass (Micropterus salmoides) larviculture

Jovanka Lukić, Norbert Vass, László Ardó, Jelena Stanivuk, Éva Lengyel-Kónya, Nataša Golić, Zsuzsanna Jakabné Sándor, Uroš Ljubobratović

Czech J. Anim. Sci., 2024, 69(12):471-483 | DOI: 10.17221/129/2024-CJAS  

This research evaluated the suitability of commercially available larval feeds, Otohime B2 (OB2), Aller Infa (AI), and Aqua Start (AS), and one Experimental Feed (EF), for the weaning of largemouth bass (Micropterus salmoides), LMB. Feeds were presented with various ω-3 fatty acid levels/bioavailability (high in OB2 and AI), fat percentage (high in OB2 and AS), free amino acid and short peptide (FAA + SP) levels (high in OB2), and various soluble protein (SPR) levels (high in AS and EF). Fish were co-fed Artemia plus OB2 from the 19^th to 22^nd day post-hatching (DPH), then Artemia in addition...

Pedigree analysis of the Latvian Warmblood horse heavy type population

Viktorija Nikonova, Daina Jonkus, Liga Paura

Czech J. Anim. Sci., 2024, 69(11):462-469 | DOI: 10.17221/147/2024-CJAS  

A breeding program has been developed for the Latvian warmblood heavy type horses in Latvia, with the aim to preserve this type, because the number of these horses is small and the status of the local endangered breed has been granted. The aim of the study was to analyse the genetic structure, inbreeding and effective population size of the Latvian warmblood heavy type (LSB) horse population. Horses that were living at the time of the study on January 1, 2023 were used for the study. A total of 374 genetic resources live horses were analysed. Population structure analysis, inbreeding and effective population size were investigated. Calculations...

Dietary antioxidant supplementation improves the in vitro quality and antioxidant capacity of Colombian Creole stallion semen

Maria Claudia Puerta, Laura Henao-Salazar, Isabel Catalina Vélez, Sergio León, Banjamín Rojano, Giovanni Restrepo, Alexandra Úsuga

Czech J. Anim. Sci., 2024, 69(11):450-461 | DOI: 10.17221/98/2024-CJAS  

Dietary antioxidant supplementation has become popular for managing male infertility because of its impact on the antioxidant capacity of semen. This study evaluates the effect of dietary antioxidant supplementation on the seminal characteristics of Colombian Creole horses. Semen from six Colombian Creole stallions was collected using an artificial vagina. The stallions were randomly allocated to a control group (CG) or a supplementation group (SG) that received a multi-antioxidant supplement. A repeated measures design, with a wash out period of two weeks between treatments, was used. Sperm motility and kinematics were assessed using a computer-assisted...

The effect of the dried Gracilaria spp. undergoing different drying methods on in vitro rumen fermentation

Farwa Shakeel, Yeni Widiawati, Sharly Asmairicen, Agung Purnomoadi, Agustin Herliatika, Yenny Nur Anggraeny, Setiasih Setiasih, Muhammad Rizwan, Ruslan Abdul Gopar, Antonius Antonius, Igit Atang Sunante, Idris Idris, Susi Riyanti, Winwin Widaringsih, Faizan Ahmad Shakir, Saad Irfan

Czech J. Anim. Sci., 2024, 69(11):441-449 | DOI: 10.17221/75/2024-CJAS  

Seaweed has an important role in the mitigation of enteric methane (CH₄) production by ruminant animals. The utilisation and its effectiveness in enteric CH₄ reduction require a preservation process. The aim of the study was to investigate the effect of different drying processes on the effectiveness of seaweed Gracilaria spp. in reducing CH₄ production assessed through an in vitro method. Three drying techniques, sun-drying, oven-drying, and freeze-drying, were applied to produce a dried product of Glacilaria spp. Rice straw basal diets combined with concentrate at the 70 : 30% were...

Quality and in vitro fertilising ability of cryostored Pinzgau bull insemination doses

Lucia Olexiková, Linda Dujíčková, Jaromír Vašíček, Andrej Baláži, Andrea Svoradová, Lenka Kuželová, Alexander Makarevich, Peter Ivanič, Peter Chrenek

Czech J. Anim. Sci., 2024, 69(11):431-440 | DOI: 10.17221/142/2024-CJAS  

Applicability of cryopreserved insemination doses is dependent on the quality of the semen after thawing. The aim of the study was to check the options of new markers for the assessment of sperm quality to predict their fertilisation ability. In five bulls of the Pinzgau breed, the sperm fertilising ability was determined using the in vitro fertilisation. Bulls were divided according to the achieved blastocyst rate: bulls with good fertilising ability (NOB – 38.6%, KAZ – 28.9%, GAL – 29.3%) and bulls with low fertilising ability (LOH – 19.4%, NUS – 22.1%). In addition to the sperm motility and morphology,...

A survey on rabbit meat perception and consumption in seven countries

Katalin Szendrő, Antonella Dalle Zotte, Nikoletta Fülöp, Mónika Zita Nagy

Czech J. Anim. Sci., 2024, 69(10):419-429 | DOI: 10.17221/123/2024-CJAS  

The aim of the study was to examine the rabbit consumption habits and opinions of people living in countries that regularly consume rabbit meat. Snowball sampling of data collection was used, a total of 1 860 error-free questionnaires were evaluated. Most of the completed questionnaires came from Hungary, Italy, Spain, China, Poland, France and Mexico. It is to note that 21.3% of respondents have not yet consumed rabbit meat: China (32.1%), Hungary (24.7%), Poland (22.4%), and France (4.8%). The main reasons for not consuming rabbit meat were emotional reasons (22.3%), it does not fit their dietary habits (15.7%). There are 28.7% of respondents...

Glutamine protects cow's ruminal epithelial cells from acid-induced injury in vitro

Yuanxiao Li, Yan Yu, Feiyan Zhao, Zihan Zhao, Mengying Dou, Zhijun Cao, Wang Li, Ke Ding, Cai Zhang

Czech J. Anim. Sci., 2024, 69(10):410-418 | DOI: 10.17221/170/2023-CJAS  

This study was conducted to investigate the effects and mechanisms of glutamine (Gln) on the repair of acid-induced injury in dairy cow ruminal epithelial cells (RECs) in vitro. Dairy cow RECs were cultured in a medium with pH of 5.5 for 3 h and subsequently treated with various concentrations of Gln (4, 8, 12, 32 mmol/l) for 12 h. The messenger ribonucleic acid (mRNA) expression levels of occludin (OCLN), claudin 1 (CLDN1), toll-like receptor 2 (TLR2), toll-like receptor 4 (TLR4) and genes for inflammatory factors were measured using reverse transcription-quantitative real-time PCR (RT-qPCR)....

Comparative study: Efficacy of egg-yolk vs soy lecithin-based diluent in preservation of chilled bovine semen – Bacteriology and sperm quality

Michal Ďuračka, Filip Benko, Miroslava Kačániová, Eva Tvrdá

Czech J. Anim. Sci., 2024, 69(10):400-409 | DOI: 10.17221/138/2024-CJAS  

This study compared the efficacy of the egg yolk (EY) and soy lecithin (SL) semen extender during 72-h storage at 4 °C in the presence/absence of streptomycin, penicillin, lincomycin, and spectinomycin. Bull semen samples (n = 12) were obtained and stored in either ANDROMED^® (SL extender) or TRILADYL CSS^® (EY extender). After 24, 48, and 72 h of storage at 4 °C, bacterial colonies (CFU – colony forming units) were grown and counted on tryptic soy and blood agar, and the bacterial isolates were identified using the MALDI-TOF MS Biotyper. Sperm motility, mitochondrial membrane potential (MMP), membrane...

Approach to creating an intelligent system for free-range livestock farming

Radka Malinova, Pencho Malinov, Evgeni Valchev, Todorka Glushkova

Czech J. Anim. Sci., 2024, 69(10):389-399 | DOI: 10.17221/90/2024-CJAS  

The development of intelligent systems for the tracking of free-range livestock is a challenge to both information and communication technology (ICT) scientists and those in the animal sciences. Cyber-physical systems make it possible to track and control processes involving intelligent objects from the physical and virtual worlds. In the case of free-range grazing, it is necessary to manage processes in two domains ‒ that of the intelligent pasture management and that of the animals. Due to the differences in the conditions of different types of pastures – plain or high land and the characteristics of the cattle breeds, ready-made...

Does the incidence of egg yolk influence the meat quality and fatty acid profile of broilers of two chicken genotypes?

Antonella Dalle Zotte, Marco Cullere, Bianca Palumbo, Tamás Donkó, Zoltán Sütő, Gábor Milisits

Czech J. Anim. Sci., 2024, 69(9):378-387 | DOI: 10.17221/122/2024-CJAS  

The present experiment studied the effects of egg composition (egg yolk content; Y) of two different chicken genotypes (selected by computed tomography; CT) on hatched chick growth performance, slaughter traits, and meat quality. Three thousand five hundred eggs per genotype were scanned by CT. Then, for each genotype, eggs were selected according to their Y content: low (21.0 ± 0.88 – 350 eggs), medium (24.5 ± 0.15– 350 eggs) and high (28.3 ± 0.98 – 350 eggs). The remaining eggs were excluded from the study. At 11 weeks of age, 15 chickens per group were slaughtered, carcasses were dissected and breast and legs...

Preliminary results on the antioxidant capacity of the Coffea arabica grounds extract on semen parameters of Fleckvieh cattle in the Amazonas region

Deiner Jhonel Gongora-Bardales, Marilu Mestanza Mendoza, Gleni Tatiana Segura Portocarrero, Lizeth Amparo Heredia Vilchez, Jonathan Alberto Campos Trigoso, José Américo Saucedo-Uriarte, Hugo Frias Torres, Rainer Marco López Lapa, Segundo Jose Zamora Huaman, William Bardales Escalante, Nilton Luis Murga Valderrama

Czech J. Anim. Sci., 2024, 69(9):367-377 | DOI: 10.17221/115/2024-CJAS  

Livestock farming is vital to a country's economy, and technological innovations in animal genetics and reproductive biotechnologies are key for environmental and socioeconomic development. This study aimed to evaluate the antioxidant capacity of Coffea arabica grounds (CAG) extract on the semen parameters of Fleckvieh cattle. CAG was processed, and its antioxidant capacity was assessed using DPPH, FRAP, and total phenols assays. Semen was collected from a pedigree bull and analysed macroscopically and microscopically. Different concentrations of CAG (0, 1, 1.5, and 2 mg/ml) were tested at 4, 12, 24, and 36 h post-refrigeration. The study...

The effect of different forages on rumen microbiota and milk production performance in Holstein dairy cows

Szu Han Wang, Hsiao Han Liao, Chia-Xin Lee, Hsiao-Ming Chen, Ling-You Chen, Shih-Te Chuang, Jih-Tay Hsu

Czech J. Anim. Sci., 2024, 69(9):356-366 | DOI: 10.17221/86/2024-CJAS  

Optimising the feed composition, especially the forage choice, and reducing costs are essential for improving dairy production efficiency. Different forage sources and proportions were used to formulate rations containing equal energy and protein, and their effects on rumen microbiota and milk production performance of dairy cows were evaluated in two experiments. In experiment 1, thirty lactating cows (235 ±13 d postpartum; milk production 29.1 ± 1.0 kg/day) were divided into Pangola and Bermuda groups. In experiment 2, twenty lactating cows (79.9 ± 8.1 d postpartum; milk production 34.7 ± 0.6 kg/day) were divided into...

Changes in the oxidative - biochemical status in dairy cows during the transition period affecting reproductive and health parameters.

Jiří Bezdíček, Andrea Nesvadbová, Jaromír Ducháček, Jana Sekaninová, Luděk Stádník, Martina Janků

Czech J. Anim. Sci., 2024, 69(9):345-355 | DOI: 10.17221/128/2024-CJAS  

Negative energy balance (NEB) after calving leads to unique metabolic changes in cows and it provides important information on the period when nutrient output prevails over nutrient intake associated with a number of physiological changes in the organism suitable for detection using biochemical blood analyses. The aim of this paper is to summarise current knowledge of the changes in blood parameters during the period of NEB in relation to non-esterified fatty acids, ketone bodies, and immunologic and stress indicators. The impact of these changes on bovine reproduction and health is also discussed in the sequel. The period of NEB is still...

Cryopreservation of early-stage male Black Sea trout (Salmo trutta labrax) germ cells and comparison of the whole tissue and enzymatically isolated cells

Ege Güngör, Aygül Ekici, Merve Erçin, Selda Oktayoğlu, Taiju Saito, İlker Keskin

Czech J. Anim. Sci., 2024, 69(8):331-343 | DOI: 10.17221/71/2024-CJAS  

The high plasticity, or the ability to differentiate into various cell types, and capacity to become both gametes of early-stage germ cells (eGCs) allows them to be used for the long-term storage and recovery of genetic information. In this study, species-specific protocols (isolation period, enzymatic separation solution, incubation period, appropriate cryoprotectant, and cryopreservation protocol) were established for the isolation and long-term preservation of Black Sea trout eGCs. In addition, the difference between the application of cryopreservation to the whole gonad tissue and to the enzymatically separated cells has been shown in terms...

Whole-genome sequencing revealed the population structure of Fujian chicken breeds

Zhiming Zhu, Linli Zhang, Qingwu Xin, Li Li, Zhongwei Miao, Qinlou Huang, Nenzhu Zheng

Czech J. Anim. Sci., 2024, 69(8):323-330 | DOI: 10.17221/91/2023-CJAS  

Indigenous chicken breeds from Fujian Province, China, exhibit unique and distinctive phenotypic characteristics, including morphology, behaviour, integumentary pigmentation, feather colouration, and production performance. However, the underlying genetic basis governing these specific traits remains unclear. This study aimed to elucidate the population structure of six Fujian local chicken breeds [Bairong chickens (BRCs), Jinhu chickens (JHCs), Minqing chickens (MQCs), Dehua chickens (DHCs), Xiangdong chickens (XDCs), and Hetian chickens (HTCs)] in terms of their genetic resources within the province. The whole-genome resequencing revealed 8 678 612...

Pedigree-based genetic diversity of Debrecen White rabbit

János Posta, Noémi Anikó Szabó, Róbert Juráskó

Czech J. Anim. Sci., 2024, 69(8):317-322 | DOI: 10.17221/116/2024-CJAS  

This research was carried out to evaluate the pedigree data of the Debrecen White rabbit breed. Pedigree information was supplied by the Debrecen White Rabbit Breeder Association. The final dataset contained all available information on animals registered by the breeding association up to 2023. The reference population was the active breeding stock in 2023. The estimated complete generation equivalent was 7.8, while the mean of maximum generations was 16.29 for the present stock. All individuals within the current population were inbred, with a 5.37% mean inbreeding coefficient. The division of the inbreeding coefficient showed that homozygosity...

The stability of fatty acids in yoghurts produced from bulk milk samples intentionally selected according to dairy production systems

Oto Hanuš, Eva Samková, Jindřich Čítek, Hana Nejeschlebová, Eva Dadáková, Lucie Hasoňová, Michael Rost, Irena Němečková, Karolína Reindl, Markéta Borková, Ondřej Elich

Czech J. Anim. Sci., 2024, 69(8):303-316 | DOI: 10.17221/84/2024-CJAS  

The fatty acid (FA) composition of milk fat can be positively influenced by the modification of dairy farming and the possible selection of raw material for processing. The question arises as to whether the benefits of a better FA composition will be maintained even after processing dairy products. Thus, the aim was to obtain a more favourable FA composition by a targeted selection of cow’s milk (grazing vs stabled herds) and then compare FAs of milk and fermented product (yoghurt). Bulk tank milk of grazing herds had significantly better FA composition than milk of stabled herds (for example, C16:0 28.07% vs 32.27%,...

Corrigendum: A decision support system based on disease scoring enables dairy farmers to proactively improve herd health

Saro Jan

Czech J. Anim. Sci., 2024, 69(7):302 | DOI: 10.17221/111/2024-CJAS  

Effect of tannin degradation of mangrove (Sonneratia alba) fruit on nutrient digestibility, protozoa population and methane gas production

Elihasridas Elihasridas, Roni Pazla, Novirman Jamarun, Gusri Yanti, Sharli Asmairicen, Leni Marlina, Maureen Chrisye Hadriatry, Ratna Wylis Arief, Hadriana Bansi, Shahid Ullah Khan, Faheem Ahmed Khan, Ezi Masdia Putri, Antonius Antonius, Zaitul Ikhlas, Zahlul Ikhsan, Laily Rinda Ardani, Anggela Titania Siva, Hileri Yendrita, Fezi Zelinea

Czech J. Anim. Sci., 2024, 69(7):292-301 | DOI: 10.17221/38/2024-CJAS  

This study examined the fermentation duration in relation to the effectiveness of tannin levels in mangrove (Sonneratia alba) fruit during the fermentation process using Aspergillus niger. The tested durations were 7, 10, 13, and 16 days in anaerobic conditions. The outcomes measured included crude fat, crude fibre, and nitrogen-free extract digestibility. Microbial biomass, protozoa population, and methane gas production were also recorded as responses to the rumen microbial activity. The results showed that 16 days of fermentation gave the highest average for all responses. The protozoa population reached around 4.07 × 10⁵ cells/ml...

How the milk chemical composition and fatty acid profile are influenced by physiological factorsin Najdi dairy sheep

Abdulkareem Mohammed Matar, Faisal Ahmed Alshamiry, Ramzi Ahmed Amran, Riyadh Salah Aljumaah, Muneeb Musthafa, Massimo Todaro

Czech J. Anim. Sci., 2024, 69(7):280-291 | DOI: 10.17221/37/2024-CJAS  

Sheep milk production is a complex process that is influenced by various factors. This study aims to investigate how the litter size (single vs. twins), birth type (male vs. female), age of the ewes and body weight affect the milk composition and fatty acid profile of milk fat. Milk samples were collected from 119 Najdi ewes that were the subject of this study. Gas chromatography-mass spectrometry (GC-MASS) was used to quantify the fatty acids (FAs). The results showed that the twins birth type (female/female) has a significant influence (P < 0.05) on the concentration of linoleic acid (LA), alpha-linolenic acid (ALA), behenic...

Commonly used genomic estimators of individual inbreeding in livestock

Adrián Halvoník, Nina Moravčíková, Monika Chalupková, Radovan Kasarda

Czech J. Anim. Sci., 2024, 69(7):269-279 | DOI: 10.17221/91/2024-CJAS  

Abstract: Management of inbreeding is one of the crucial parts of breeding programs in livestock populations. Traditionally, the inbreeding coefficient is calculated using pedigree data; however, it can also be estimated from genomic data. Nowadays, various approaches to estimating genomic-based inbreeding coefficients are increasingly integrated into research and breeding practices. These genomic estimators can supplement or replace pedigree-based coefficients. Each genomic-based inbreeding coefficient has its own properties and different ranges of values, and some of them need specific settings for calculation. Moreover, depending on the methodological...

The impact of parity, litter size and birth weight variations within a litter on piglet pre-weaning performance

Nqobile Lungile Buthelezi, Bohani Mtileni, Khathutshelo Agree Nephawe, Peter Ayodeji Idowu, Mamokoma Catherine Modiba, Hezekiel Mpedi, Takalani Judas Mpofu

Czech J. Anim. Sci., 2024, 69(7):255-268 | DOI: 10.17221/36/2024-CJAS  

Sows are selected for their prolificacy. Therefore, assessing difficulties that can be associated with large litters is crucial. This review aims to highlight the factors that can affect reproductive performance such as breed, parity, litter size, environment, and nutrition. Understanding these factors can help producers make informed decisions about sow management and other aspects. Higher within-litter variation is the result of  a  high number of piglets born. It has been determined that large litter sizes pose a risk to animal welfare in the pig industry. Moreover, large litters bring more piglets with low birth weight leading to high pre-weaning...

Effects of maize silage withdrawal from finishing ration on weight gain, carcass yield and beef quality of Holstein Friesian × Belgian Blue crossbred bulls

Tayfun Gündüz, Hayrettin Çayıroğlu

Czech J. Anim. Sci., 2024, 69(6):219-229 | DOI: 10.17221/40/2024-CJAS  

This study was practical work in a commercial beef cattle enterprise to offer beef producers different options in a total mixed ration (TMR) design. This study was conducted to determine the effects of withdrawing maize silage from TMR during the finishing period on weight gain, carcass yield and beef quality of meat in beef cattle. Fifty-two Holstein Friesian x Belgian Blue crossbred bulls were used in this study for 126 days. These bulls were divided into four feeding methods described as (i) no maize silage in TMR (C1), (ii) maize silage was withdrawn from TMR two months before slaughter (S1), (iii) maize silage was withdrawn from TMR one month...

Relationship between rib fat thickness and carcass price among different carcass weight groups in Korean native cattle

Eunjeong Jeon, Sangbuem Cho, Myungsun Park, Sung-Il Ahn, Junior Isaac Celestin Poaty Ditengou, Ki-Beom Kim, Sung-Sub Shin, Nag-Jin Choi

Czech J. Anim. Sci., 2024, 69(6):211-218 | DOI: 10.17221/57/2024-CJAS  

The study assessed the relationship between rib fat thickness and carcass price among different carcass weight groups in Korean native cattle (Hanwoo), taking into account changes in the beef grading system. Data from 8 926 Hanwoo steers, with an average age of 30.6 ± 1.88 months and slaughtered between 2017 and 2019, were analysed. The variables considered included rib fat thickness, carcass weight, eye muscle area, marbling score, and carcass price. Steers were categorised into eight carcass weight groups ranging from 250 kg to 650 kg in the original system, rib fat thickness consistently had a negative impact on carcass price, with partial...

Comparative study on the large-scale intensive culture of pikeperch (Sander lucioperca) larvae: Evaluation of two different live exogenous food options

Václav Kučera, Tomáš Pěnka, Oleksandr Malinovskyi, Carlos Yanes-Roca, Zhaxygali B. Kuanchaleyev, Tomáš Policar

Czech J. Anim. Sci., 2024, 69(6):243-254 | DOI: 10.17221/42/2024-CJAS  

This study is focused on the comparison of production efficiency (growth, survival, and development) and economic evaluation of large-scale larvae culture in pikeperch (Sander lucioperca) using Artemia (Group A) compared to using rotifers and the subsequent combination of rotifers and Artemia (Group R) as a first exogenous feed following weaning and intensive culture of juveniles. Both experimental groups were stocked with the same initial density (100 pcs per litre) of larvae at 4 days post hatching (DPH). Each group was cultured in triplicate until 65 DPH. Assessed parameters included FBW (final body weight), FTL (final total length), SGR (specific...

Influence of daily feed ration on growth and condition of juvenile pikeperch (Sander lucioperca) reared in a recirculating aquaculture system (RAS)

Tomáš Pěnka, Oleksandr Malinovskyi, Jitka Kolářová, Václav Kučera, Tomáš Policar

Czech J. Anim. Sci., 2024, 69(6):230-242 | DOI: 10.17221/33/2024-CJAS  

The study tested the effect of daily feed ration (DFR: 0.5%, 0.75%, 1.0%, 1.25%, and 1.5% of fish biomass) on juvenile pikeperch (Sander lucioperca) with an initial body weight of 21.5 ± 5.1 g and total length of 144.5 ± 8.5 mm. The pikeperch were fed floating feed at 8-hour intervals for a duration of 84 days. By the end of the experiment, the group fed DFR of 1.5% exhibited the highest body weight (51.5 ± 16.1 g) and total length (188.2 ± 17.8 mm). The weight heterogeneity, measured as the coefficient of variation (CV), ranged between 30.29 and 33.24%. The specific heterogeneity rate (SHR) ranged from 304.44 to 334.94‰/day....

Corrigendum: Protective effects of green tea (Camellia sinensis) extract against cypermethrin-induced neurotoxicity in rainbow trout (Oncorhynchus mykiss) brain tissues

Murteza Cakir

Czech J. Anim. Sci., 2024, 69(5):209 | DOI: 10.17221/83/2024-CJAS  

A decision support system based on disease scoring enables dairy farmers to proactively improve herd health

Jan Saro, Luděk Stádník, Petra Bláhová, Simona Huguet, Helena Brožová, Jaromír Ducháček

Czech J. Anim. Sci., 2024, 69(5):165-177 | DOI: 10.17221/53/2024-CJAS  

Decision support systems (DSSs) enable dairy farmers to make informed and timely decisions on herd health management. However, the lack of a disease scoring system by category and severity limits the application of this approach. In this study, we developed an innovative approach to dairy herd health management by establishing a novel scoring system for dairy herd health management aimed at providing a more nuanced understanding of disease impact. For this purpose, we retrieved 5-year data from 2 558 disease diary records of 798 primiparous and multiparous cows housed on a Czech farm and classified 125 production diseases into six categories, namely...

High percentage of morphological defects in sperm of the Zemplin rabbit breed: A major obstacle to fertility?

Jakub Vozaf, Andrea Svoradová, Jaromír Vašíček, Lucia Olexiková, Andrej Baláži, Hana Ďuránová, Alexander Ostró, Silvia Toporcerová, Peter Chrenek

Czech J. Anim. Sci., 2024, 69(5):191-199 | DOI: 10.17221/29/2024-CJAS  

This research investigates the high prevalence of morphological defects in the sperm of a particular rabbit breed, namely the Zemplin rabbit (ZR). We tried to uncover the possible causes and consequences of the observed abnormalities. Ejaculate samples from ten adult males were divided into two qualitative groups according to the motility parameters revealed by CASA (computer-assisted sperm analysis). Group A contained samples with total motility (TM) above 50% and progressive motility (PM) above 30%. Group B contained samples with TM and PM below these values. Viability (SYBR-14/DRAQ5^TM and SYTOX^TM Green/DRAQ5^TM staining)...

Meta-analysis of genetic parameters for productive traits in Nile tilapia (Oreochromis niloticus)

Elizangela Zayana Lima D'suze, Nandrya Hayne Santos de Lima, Denise de Assis Paiva, Nilsa Duarte da Silva Lima, Thalles Ribeiro Gomes, José Teodoro de Paiva

Czech J. Anim. Sci., 2024, 69(5):200-208 | DOI: 10.17221/6/2024-CJAS  

The advances in the production traits of Oreochromis niloticus are due to the development of genetically superior broodstock animals. Understanding the genetic variability of fish stocks is crucial to any animal breeding program. The aim of this study was to perform a meta-analysis of genetic parameters that considers the variability between studies for economically important traits in the Nile tilapia (Oreochromis niloticus) production. The final dataset from literature review contained 226 estimates of heritability and 53 estimates of genetic correlation across 37 peer-reviewed articles published between 2002 and 2022. Weighted genetic...