Template-Type: ReDIF-Article 1.0 Author-Name: Aadi Remmik Author-Workplace-Name: Institute of Economics and Social Sciences, Estonian University of Life Sciences, Tartu, Estonia Author-Name: Rando Värnik Author-Workplace-Name: Institute of Economics and Social Sciences, Estonian University of Life Sciences, Tartu, Estonia Author-Name: Kalle Kask Author-Workplace-Name: Institute of Veterinary Medicine and Animal Sciences, Estonian University of Life Sciences, Tartu, Estonia Title: Impact of calving interval on milk yield and longevity of primiparous Estonian Holstein cows Abstract: 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. Keywords: dairy, lactation, persistency Journal: Czech Journal of Animal Science Pages: 365-372 Volume: 65 Issue: 10 Year: 2020 DOI: 10.17221/130/2020-CJAS File-URL: http://cjas.agriculturejournals.cz/doi/10.17221/130/2020-CJAS.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/cjs-202010-0001.txt Handle: RePEc:caa:jnlcjs:v:65:y:2020:i:10:id:130-2020-CJAS Template-Type: ReDIF-Article 1.0 Author-Name: Wenfeng Ma Author-Workplace-Name: College of Animal Science and Technology, Henan University of Science and Technology, Henan, P.R. China Author-Workplace-Name: College of Animal Science and Technology, China Agricultural University, Beijing, P.R. China Author-Name: Yi Lv Author-Workplace-Name: College of Animal Science and Technology, Henan University of Science and Technology, Henan, P.R. China Author-Name: Liang Guo Author-Workplace-Name: College of Animal Science and Veterinary Medicine, Tianjin Agricultural University, Tianjin, P.R. China Author-Name: Zhanbin Wang Author-Workplace-Name: College of Animal Science and Technology, Henan University of Science and Technology, Henan, P.R. China Author-Name: Furong Zhao Author-Workplace-Name: College of Animal Science and Technology, Henan University of Science and Technology, Henan, P.R. China Title: Effects of three kinds of protease on growth performance, apparent digestibility of nutrients and caecal microbial counts in weanling pigs Abstract: 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 protease increased average daily gain and reduced serum concentrations of cholesterol and triglyceride compared with the control group (P < 0.05). The three single kinds of protease supplementation decreased the levels of serum urea nitrogen and increased the serum concentration of aspartate aminotransferase (P < 0.05). The apparent digestibility of crude protein was increased by the dietary supplementation of alkaline or acidic protease compared with that of pigs in the control group (P < 0.05). Results indicate that the alkaline protease supplementation improved the performance and apparent digestibility of crude protein in weanling pigs. Keywords: enzyme preparation, growth, piglets Journal: Czech Journal of Animal Science Pages: 373-379 Volume: 65 Issue: 10 Year: 2020 DOI: 10.17221/125/2020-CJAS File-URL: http://cjas.agriculturejournals.cz/doi/10.17221/125/2020-CJAS.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/cjs-202010-0002.txt Handle: RePEc:caa:jnlcjs:v:65:y:2020:i:10:id:125-2020-CJAS Template-Type: ReDIF-Article 1.0 Author-Name: Antonella Dalle Zotte Author-Workplace-Name: Department of Animal Medicine, Production and Health, Agripolis, University of Padova, Padova, Italy Author-Name: Marco Cullere Author-Workplace-Name: Department of Animal Medicine, Production and Health, Agripolis, University of Padova, Padova, Italy Author-Name: Elizabeth Gleeson Author-Workplace-Name: Department of Animal Medicine, Production and Health, Agripolis, University of Padova, Padova, Italy Author-Name: Maria Elena Cossu Author-Workplace-Name: Department of Animal Production, Faculty of Agronomy, University of Buenos Aires, Buenos Aires, Argentina Title: Animal fat and vitamin E in rabbit diets: Total tract apparent digestibility, growth performance, carcass and meat quality traits Abstract: 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 protein (P < 0.05) and ether extract (P < 0.001) total tract apparent digestibility, and the same was observed for the vitamin E inclusion (P < 0.001 for both variables). This improved the dietary digestible protein content (P < 0.05), which increased the digestible protein to digestible energy ratio (P < 0.001). The fat × vitamin E interaction was observed for the total tract apparent digestibility of the ether extract (P < 0.001), the neutral detergent fibre (P < 0.05) and the acid detergent fibre (P < 0.01). The growth traits were unaffected, with the exception of the feed conversion ratio that improved with the vitamin E addition (P < 0.05). Similarly, the carcass traits remained unaffected, with the exception of the perirenal and total fat incidence that increased with the fat supplement (P < 0.05), and the scapular fat that was reduced with the vitamin E inclusion (P < 0.05). The meat L* (lightness), a* (redness), b* (yellowness) colour values and ultimate pH were unaffected by the experimental treatments, even though a fat × vitamin E interaction was observed for the a* and chroma values of the Longissimus thoracis et lumborum muscle (P < 0.05). Both the fat (P < 0.05) and vitamin E (P < 0.001) dietary inclusion increased the meat α-tocopherol content. Based on the results, it was concluded that the 2% dietary inclusion of animal fat did not provide more benefits for the considered parameters than the sole α-tocopheryl acetate incorporation, but contributed to the increase in the vitamin E content in the meats. Keywords: antioxidant, dietary strategy, monogastric, nutrition, nutritive value, supplement Journal: Czech Journal of Animal Science Pages: 380-388 Volume: 65 Issue: 10 Year: 2020 DOI: 10.17221/203/2020-CJAS File-URL: http://cjas.agriculturejournals.cz/doi/10.17221/203/2020-CJAS.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/cjs-202010-0003.txt Handle: RePEc:caa:jnlcjs:v:65:y:2020:i:10:id:203-2020-CJAS Template-Type: ReDIF-Article 1.0 Author-Name: Jiu Yuan Author-Workplace-Name: College of Animal Science and Technology, Gansu Agricultural University, Lanzhou, P.R. China Author-Name: Xinjie Wan Author-Workplace-Name: Gansu Zhenghe Biotechnology Co., Ltd, Lanzhou, P.R. China Author-Name: Guoshun Chen Author-Workplace-Name: College of Animal Science and Technology, Gansu Agricultural University, Lanzhou, P.R. China Title: 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 vitro Abstract: 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 72 h incubation, pH, volatile fatty acids (VFA) and ammonia nitrogen (NH3-N), dry matter digestibility (DMD), organic matter digestibility (OMD) were determined the incubation fluid and residues. The single-factor AE index (SFAEI) and multiple-factor AE index (MFAEI) were computed. The results showed that the groups 50 : 50 : 0, 40 : 60 : 0, 60 : 20 : 20, 60 : 10 : 30, 50 : 30 : 20, 50 : 20 : 30, 40 : 50 : 10, 30 : 55 : 15, 30 : 40 : 30, 20 : 65 : 15, 20 : 50 : 30 had higher GP72 h, a, b, DMD, OMD, NH3-N, in addition, higher AE of GP, DMD, OMD, total VFA and NH3-N than those of the other groups (P < 0.05 or P < 0.01), especially the group 30 : 55 : 15 was optimal. In conclusion, in vitro data reveal reliable fermentability and the highest SFAEI and MFAEI occurred when concentrate, soybean pod and alfalfa were combined at the ratios of 50 : 50 : 0, 40 : 60 : 0, 60 : 20 : 20, 60 : 10 : 30, 50 : 30 : 20, 50 : 20 : 30, 40 : 50 : 10, 30 : 55 : 15, 30 : 40 : 30, 20 : 65 : 15, 20 : 50 : 30. Keywords: soybean hull, combination effects, clover, commercial concentrate, in vitro incubation Journal: Czech Journal of Animal Science Pages: 389-401 Volume: 65 Issue: 10 Year: 2020 DOI: 10.17221/165/2020-CJAS File-URL: http://cjas.agriculturejournals.cz/doi/10.17221/165/2020-CJAS.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/cjs-202010-0004.txt Handle: RePEc:caa:jnlcjs:v:65:y:2020:i:10:id:165-2020-CJAS Template-Type: ReDIF-Article 1.0 Author-Name: Afaf Abdelrahman Elshereef Author-Workplace-Name: Laboratory of Climate Change and Livestock Production, Department of Animal Nutrition, Faculty of Veterinary Medicine and Animal Science, University of Yucatan, Merida, Yucatan, Mexico Author-Name: Julian Arroyave-Jaramillo Author-Workplace-Name: Laboratory of Climate Change and Livestock Production, Department of Animal Nutrition, Faculty of Veterinary Medicine and Animal Science, University of Yucatan, Merida, Yucatan, Mexico Author-Name: Lucas Miguel Zavala-Escalante Author-Workplace-Name: Laboratory of Climate Change and Livestock Production, Department of Animal Nutrition, Faculty of Veterinary Medicine and Animal Science, University of Yucatan, Merida, Yucatan, Mexico Author-Name: Angel Trinidad Piñeiro-Vázquez Author-Workplace-Name: Technological National of Mexico, I.T. Conkal, Conkal Division of Graduate Studies and Research, Conkal, Yucatan, Mexico Author-Name: Carlos Fernando Aguilar-Pérez Author-Workplace-Name: Laboratory of Climate Change and Livestock Production, Department of Animal Nutrition, Faculty of Veterinary Medicine and Animal Science, University of Yucatan, Merida, Yucatan, Mexico Author-Name: Francisco Javier Solorio-Sánchez Author-Workplace-Name: Laboratory of Climate Change and Livestock Production, Department of Animal Nutrition, Faculty of Veterinary Medicine and Animal Science, University of Yucatan, Merida, Yucatan, Mexico Author-Name: Juan Carlos Ku-Vera Author-Workplace-Name: Laboratory of Climate Change and Livestock Production, Department of Animal Nutrition, Faculty of Veterinary Medicine and Animal Science, University of Yucatan, Merida, Yucatan, Mexico Title: Corrigendum: Enteric methane emissions in crossbred heifers fed a basal ration of low-quality tropical grass supplemented with different nitrogen sources Journal: Czech Journal of Animal Science Pages: 402 Volume: 65 Issue: 10 Year: 2020 DOI: 10.17221/12995-CJAS File-URL: http://cjas.agriculturejournals.cz/doi/10.17221/12995-CJAS.html File-Format: text/html Handle: RePEc:caa:jnlcjs:v:65:y:2020:i:10:id:12995-CJAS