Czech Journal of Animal Science, 2021 (vol. 66), issue 2
Principal component analysis of conformation traits in Hungarian Simmental cowsOriginal Paper
Evelin Török, István Komlósi, Béla Béri, Imre Füller, Barnabás Vágó, János Posta
Czech J. Anim. Sci., 2021, 66(2):39-45 | DOI: 10.17221/155/2020-CJAS 
The aim of the current research was to analyze the linear type traits of Hungarian Simmental dual-purpose cows scored in the first lactation using principal component analysis and cluster analysis. Data collected by the Association of Hungarian Simmental Breeders were studied during the work. The filtered database contained the results of 8 868 cows, born after 1997. From the evaluation of main conformation traits, the highest correlations (r = 0.35, P < 0.05) were found between mammary system and feet and legs traits. Within linear type traits, the highest correlation was observed between rump length and rump...
Seasonal reproduction of northernmost endangered forest musk deer (Moschus berezovskii) in China and the synchronization with climatic conditionsOriginal Paper
Jing Wang, Qinbin Zheng, Chuanmeng Xia, Yong Li, Mi Zhou, Yan Sheng, Robert Bertrand Weladji, Xiuxiang Meng
Czech J. Anim. Sci., 2021, 66(2):46-54 | DOI: 10.17221/202/2020-CJAS
Reproductive rhythms, as a response to environmental seasonality, may maximize the survival possibility of both newborns and parents, which is vital for ex situ conservation and sustainable management in wildlife. Forest musk deer (Moschus berezovskii) is a critically endangered ungulate of China. In order to estimate its reproduction characteristics and performance in northern China, a historical distribution area, the parturition pattern of the northernmost captive forest musk deer in Huailai Musk Deer Farm from 2017 to 2018 was analyzed. We found that the parturition of forest musk deer was highly seasonal with a peak on May 27th,...
Optimizing the conventional method of sperm freezing in liquid nitrogen vapour for Wallachian sheep conservation programOriginal Paper
Filipp Georgijevic Savvulidi, Martin Ptacek, Anezka Malkova, Jakub Beranek, Ludek Stadnik
Czech J. Anim. Sci., 2021, 66(2):55-64 | DOI: 10.17221/226/2020-CJAS
The aim of the present study was to optimize the conventional method of sperm freezing in liquid nitrogen (LN2) vapour for successful cryopreservation of Wallachian ram sperm, the genetic resources of the Czech Republic. Sperm in straws were frozen using the conventional freezing method via a static exposure of sperm doses to LN2 vapour, or by four different modified freezing methods. Under modified freezing, straws were frozen by a discontinuous, time-dependent decremental change in the distance between the straws and the surface of LN2. The viability of sperm was evaluated by flow cytometry after sperm equilibration,...
Broiler chick performance using Saccharomyces cerevisiae yeast cell wall as an anti-mycotoxin additiveOriginal Paper
Vinícius Machado dos Santos, Gabriel da Silva Oliveira, Cristina Amorim Ribeiro de Lima, Fernando Augusto Curvello
Czech J. Anim. Sci., 2021, 66(2):65-72 | DOI: 10.17221/237/2020-CJAS
The objective of this study was to evaluate the effects of using the Saccharomyces cerevisiae yeast cell wall (YCW) as an aflatoxin B1 (AFB1) adsorbent in broiler chicken feed on performance and carcass characteristics. The present study used a randomized complete block with four treatments in a 2 (with or without AFB1) × 2 (with or without YCW) factorial design. No interaction effect (P > 0.05) between AFB1 and YCW was found on the studied performance variables. The addition of YCW to the diets stimulated the feed intake of chickens during 1-21 days of age. However, YCW did...