Czech Journal of Animal Science, 2023 (vol. 68), issue 3
The interaction between the milk production, milk components with a low frequency of analysis and factors affecting the milk composition in dual-purpose Simmental cowsOriginal Paper
Daniel Falta, Lenka Zapletalová, Oto Hanuš, Josef Kučera, Milan Večeřa, Gustav Chládek, Radek Filipčík, Tomáš Kopec, Francois Stefanus Lategan
Czech J. Anim. Sci., 2023, 68(3):99-110 | DOI: 10.17221/197/2022-CJAS 
The aim of this study was to improve the understanding of the contribution of components typically found in milk, but which are not often included in analyses, to the nutritional status of dairy cows. This was undertaken by analysing the amount and composition of milk produced by Simmental dairy cows, a dual-purpose breed farmed in the Czech Republic. Apart from the more frequently analysed group of components in milk, a less frequently analysed group of components were also investigated. This group, typically, consists of the following components: urea, casein, citric acid, beta hydroxy butyrate (BHB) ketones and free fatty acids. The average...
Using precision livestock farming for dairy herd managementOriginal Paper
Radko Loučka, Filip Jančík, Dana Kumprechtová, Veronika Koukolová, Petra Kubelková, Yvona Tyrolová, Alena Výborná, Miroslav Joch, Václav Jambor, Hana Synková, Soňa Malá, Jan Nedělník, Jaroslav Lang, Petr Homolka
Czech J. Anim. Sci., 2023, 68(3):111-121 | DOI: 10.17221/180/2022-CJAS
The aim of this study was to validate selected precision livestock farming (PLF) methods of nutrition and feeding management of high-yielding Holstein dairy cows. In a feeding trial with 36 dairy cows, the effect of replacing 0.1 kg of sodium bicarbonate in the control total mixed ration (TMR-C) with 1 kg of wheat straw in the experimental total mixed ration (TMR-S) on the physiological status of cows and the amount of milk produced (milk yield, MY) was investigated. Feed intake time (FT), as measured using tensometric feed troughs (TFT), was significantly longer with TMR-S (188 min) than with TMR-C (157 min). Differences between TMR-C and TMR-S...
Relationships between gilt development and herd production efficiency are revealed by simulationOriginal Paper
Han Zhang, Zhexi Liu, Yijun Liu, Depeng Wang, Ji Wang, Keliang Wu
Czech J. Anim. Sci., 2023, 68(3):122-128 | DOI: 10.17221/127/2022-CJAS
The gilt development level is a critical factor for profitability in the pig industry. To evaluate the impact of different gilt development levels on the age structure and production efficiency of female herds we used the performance data of a pig farm that was simulated over a ten-year period, with current production statistics from the Chinese pig industry as a basis for the model. In a herd of 600 breeding sows, we compared age structure, number born alive (NBA), longevity and sow lifetime productivity in three scenarios with gilt culling rates of 10%, 20%, and 30%. The results show that the gilt development has no significant effects on the...
White striping, woody breast and spaghetti meat: Cooccurrence and relationship with breast fillet weight in big broiler chicken flocksOriginal Paper
Jaroslav Valenta, Aftab Siddique, Eva Tůmová, Ondřej Slavíček, Amit Morey
Czech J. Anim. Sci., 2023, 68(3):129-140 | DOI: 10.17221/173/2022-CJAS
The present study aimed to determine the incidence and coincidence of white striping (WS), woody breast (WB) and spaghetti meat (SM) in raw chicken breast meat (n = 300) collected 3–3.5 h post mortem from commercial broiler flocks (Ross 708 males, 56 days of age). The fillets were scored for the occurrence and severity of WS, WB and SM using visual and tactile methods, and the relationship between myopathies and breast weight was evaluated. A total of 88% of samples (out of 300) had either one or a combination of three myopathies, leaving only 12% without any myopathies. Approximately 29% of the fillets had only one myopathy...