Czech Journal of Animal Science, 2020 (vol. 65), issue 10
Impact of calving interval on milk yield and longevity of primiparous Estonian Holstein cowsOriginal Paper
Aadi Remmik, Rando Värnik, Kalle Kask
Czech J. Anim. Sci., 2020, 65(10):365-372 | DOI: 10.17221/130/2020-CJAS 
Data about 4 474 high-yielding Estonian Holstein dairy cows from 14 herds was analysed for the impact of the first calving interval length (CI1) on milk yield (MY) and lactation persistency. The results show that cows with CI1 shorter than 12 months have on average 2 345 kg lower milk yield in the first 1 000 days of productive lifetime than those with CI1 between 14 and 16 months. This is caused by lower MY in both the first and the second lactation as well as higher probability of being culled before reaching 1 000 days of productive life.
Effects of three kinds of protease on growth performance, apparent digestibility of nutrients and caecal microbial counts in weanling pigsOriginal Paper
Wenfeng Ma, Yi Lv, Liang Guo, Zhanbin Wang, Furong Zhao
Czech J. Anim. Sci., 2020, 65(10):373-379 | DOI: 10.17221/125/2020-CJAS
This experiment investigated the effects of three single kinds of protease on performance, serum parameters, apparent digestibility of nutrients and caecal microorganisms in weanling pigs. One hundred and ninety-two White × Landrace × Duroc hybrid pigs (7.51 ± 0.81 kg) were allotted to 1 of 4 treatments for 28 days. No protease was added to the control diet and the three experimental diets were supplemented with the same proportion of 10 IU/kg of alkaline, acidic and neutral protease, respectively. The supplementation of alkaline...
Animal fat and vitamin E in rabbit diets: Total tract apparent digestibility, growth performance, carcass and meat quality traitsOriginal Paper
Antonella Dalle Zotte, Marco Cullere, Elizabeth Gleeson, Maria Elena Cossu
Czech J. Anim. Sci., 2020, 65(10):380-388 | DOI: 10.17221/203/2020-CJAS
The present study tested the effect of a dietary inclusion with vitamin E and pork lard on the apparent digestibility of the nutrients, the growth performance, the carcass traits, the physical meat quality, and the α-tocopherol content. A total of 60 hybrid rabbits were reared in individual cages from weaning (35 days of age) until slaughter (78 days of age). A control diet with no supplements, one diet supplemented with 2% pork lard, and two diets that used the aforementioned diets supplemented with an additional 200 mg/kg α-tocopheryl acetate were designed. The diets were isoprotein and isoenergy. The fat inclusion increased the crude...
Study on the associative effects of different proportions of soybean pod, alfalfa and concentrate on the diets at different ratio of concentrate to roughage in vitroOriginal Paper
Jiu Yuan, Xinjie Wan, Guoshun Chen
Czech J. Anim. Sci., 2020, 65(10):389-401 | DOI: 10.17221/165/2020-CJAS
This study aimed to determine the associative effects (AEs) of 28 feed combinations of concentrate/soybean pod/alfalfa at different concentrate-roughage ratios that were incubated for 72 h in single tubes (120 ml) which were added 30 ml rumen buffered fluid. The gas production (GP) at 0, 2, 4, 6, 9, 12, 24, 36, 48, 72 h was recorded. A single exponential equation was applied to calculate the GP parameters a (rapid GP), b (slow GP), a + b (GP potential) and c (rate constant of slow GP that can reflect the specific process of GP, rapid and slow GP and GP rate). The AEs were calculated by 72 h GP and weighted estimation value of each combination. After...
Corrigendum: Enteric methane emissions in crossbred heifers fed a basal ration of low-quality tropical grass supplemented with different nitrogen sourcesCorrigendum
Afaf Abdelrahman Elshereef, Julian Arroyave-Jaramillo, Lucas Miguel Zavala-Escalante, Angel Trinidad Piñeiro-Vázquez, Carlos Fernando Aguilar-Pérez, Francisco Javier Solorio-Sánchez, Juan Carlos Ku-Vera
Czech J. Anim. Sci., 2020, 65(10):402 | DOI: 10.17221/12995-CJAS