Czech Journal of Animal Science, 2021 (vol. 66), issue 8

Negative impact of heat stress on reproduction in cows: Animal husbandry and biotechnological viewpoints: A reviewReview

Jiří Bezdíček, Andrea Nesvadbová, Alexander Makarevich, Elena Kubovičová

Czech J. Anim. Sci., 2021, 66(8):293-301 | DOI: 10.17221/44/2021-CJAS  

This review summarises current knowledge of the relationship between heat stress (HS) and reproduction in cattle. It focuses on research from the viewpoint of genetics (breed), from the viewpoint of reproduction physiology (in vivo and in vitro) and from the animal husbandry practice. From the viewpoint of animal husbandry, it was evidenced that heat stress influences reproduction before, during and after conception. Most publications suggest the negative impact of heat stress on the reproductive physiology of cows reflected in ovarian and follicular activity, in oocyte and embryo development, as well as in other processes studied...

In situ ruminal degradability and fermentation characteristics of novel mixtures of winter cereal and Italian ryegrass plus winter cereal silagesOriginal Paper

Worku Alemayehu, Róbert Tóthi, Szilvia Orosz, Hedvig Fébel, László Kacsala, Balázs Húth, Richárd Hoffmann, Tamás Tóth

Czech J. Anim. Sci., 2021, 66(8):302-314 | DOI: 10.17221/12/2021-CJAS  

This study was conducted using three multiparous non-lactating rumen-cannulated Holstein-Friesian dairy cows, with the objective of evaluating the in situ ruminal degradability and fermentation characteristics of novel mixtures of winter cereal and Italian ryegrass (Lolium multiflorum Lam.) plus winter cereal silages (mixture A: triticale, oats, barley and wheat; mixture B: triticale, barley and wheat; mixture C: Italian ryegrass and oats; mixture D: Italian ryegrass, oats, triticale, barley and wheat). The rumen fermentation study was conducted replacing the ensiled mixtures (experimental diets) with vetch-triticale...

The presence of pathogens in milk of ewes in relation to the somatic cell count and subpopulations of leukocytesOriginal Paper

Kristína Tvarožková, Jaromír Vašíček, Michal Uhrinčať, Lucia Mačuhová, Lukáš Hleba, Vladimír Tančin

Czech J. Anim. Sci., 2021, 66(8):315-322 | DOI: 10.17221/43/2021-CJAS  

Mastitis is a major health problem of the udder in dairy sheep breeds. For diagnosis of subclinical mastitis, somatic cell count (SCC) is commonly used. The presence of pathogens in the udder causes the increase of leukocytes and thus SCC in milk. Therefore, the aim of this study was to evaluate the presence of pathogens in the milk of ewes and the possible relationship with SCC. The changes of leukocytes subpopulation in milk samples with high SCC were evaluated as well. The experiment was carried out on a dairy farm with the Lacaune breed. This study was conducted on 45 ewes (98 milk samples) without signs of clinical mastitis. Based on somatic cell...

Effect of toys on behaviour and body weight of weaned pigs after mixingOriginal Paper

Hyun-Su Hwang, Jae-Kang Lee, Tae-Kyung Eom, Dong-Ho Lee, Shin-Jae Rhim

Czech J. Anim. Sci., 2021, 66(8):323-330 | DOI: 10.17221/22/2021-CJAS  

This study was conducted to evaluate the effects of a toy on the behaviour and body weight of weaned pigs after mixing. Two groups (192 pigs in total, control: without toy; treatment: with toy placed on the floor) of weaned pigs housed in pens (1.8 m × 1.4 m, 4 pigs/pen) were This study was conducted to evaluate the effects of a toy on the behaviour and body weight of weaned pigs after mixing. Two were observed with the aid of video technology for nine consecutive hours in the early (days 1 and 2) and late (days 38 and 39) period after mixing. Bodyweight of pigs at the end of the study (Mann-Whitney U-test, Z = -2.46, P =...

Efficacy of poly (lactic-co-glycolic acid) microparticles as a gonadotropin-releasing hormone analogue delivery system to stimulate ovulation of peled Coregonus peledOriginal Paper

Jindřiška Knowles, Jakub Vysloužil, Jan Muselík, Vlastimil Stejskal, Jan Kouřil, Peter Podhorec

Czech J. Anim. Sci., 2021, 66(8):331-338 | DOI: 10.17221/57/2021-CJAS  

The aim of the study was to determine the efficacy of poly (lactic-co-glycolic acid) microparticles as a carrier of gonadotropin-releasing hormone analogues (GnRHa) for induction of ovulation in peled Coregonus peled. Female peled were injected intraperitoneally with 1) saline solution only (control), 2) mammalian GnRHa at 25 µg/kg body weight, 3) GnRHa in 753-type microparticles at 50 µg/kg, or 4) GnRHa in 653-type microparticles at 50 µg/kg. Blood plasma samples were taken on days 0, 4, 8, and 12 post-injection. All hormone treatments induced synchronous ovulation and higher cumulative ovulation compared to controls. Hormone...