Joo Young Ho, Baeg Chang Hyun, Kim Ji Yoon, Choi Bu Gil, Paradhipta Dimas Hand Vidya, Kim Dong Hyeon, Lee Seong Shin, Kim Sam Churl
Division of Applied Life Science (BK21Four, Institute of Agriculture & Life Science), Gyeongsang National University, Jinju 52828, Korea.
Gyeongsangbuk-do Livestock Research Institute, Yeongju 36052, Korea.
J Anim Sci Technol. 2025 May;67(3):581-591. doi: 10.5187/jast.2024.e41. Epub 2025 May 31.
The present study investigated the effects of protected dietary fat and vitamin E on the reproductive performances of Hanwoo during the estrus period. The present study consisted of two experiments. Experiment 1 determined the effects of dietary supplements on the nutrient digestibility and fermentation characteristics in the rumen. Experiment 2 determined the effects of dietary supplements on blood fatty acid profiles, blood metabolites, and the pregnancy rate of Hanwoo cows. The basal diet was a total mixed ration, which was formulated for Hanwoo cows and was treated with different supplements as follows: without supplement (CON); supplemented 1% of protected fat (PF); supplemented 1% vitamin E (VE); and mixed PF and VE at 1:1 (MIX) based on dry matter (DM). The experimental diets were incubated in the rumen buffer for 72 h at 39°C with four replications and three blanks for Experiment 1. In Experiment 2, forty Hanwoo cows on estrus (2.7 ± 0.15 of parity) were assigned to each dietary treatment. Each treatment consisted of ten Hanwoo cows placed in two pens and fed individually (5 steers per pen). The feeding period was conducted for 75 days, from 30 d before to 45 d after artificial insemination (AI). In Experiment 1, dietary treatment did not affect nutrient digestibility or fermentation characteristics in the rumen except for the concentration of total volatile fatty acid (VFA). Dietary PF had a higher ( < 0.05) total VFA concentration than CON. In Experiment 2, dietary PF and MIX had higher ( < 0.05) saturated fatty acid concentrations in the blood of Hanwoo cows, while dietary VE and MIX had higher ( < 0.05) vitamin E concentrations. Estrogen concentrations in the blood of Hanwoo cows were lower ( < 0.05) in all treatments with supplementary diets. All treatments with supplementary diets had lower ( < 0.05) AI numbers, resulting in a higher pregnancy rate ( < 0.05) of Hanwoo cows. The present study found that the single and combo supplements with PF and vitamin E had beneficial effects on the reproductive performances of Hanwoo cows on estrus.
本研究调查了保护性膳食脂肪和维生素E对韩牛发情期繁殖性能的影响。本研究包括两个实验。实验1测定了日粮添加物对瘤胃养分消化率和发酵特性的影响。实验2测定了日粮添加物对韩牛血液脂肪酸谱、血液代谢物和妊娠率的影响。基础日粮为全混合日粮，专为韩牛配制，并采用以下不同添加物处理：不添加（CON）；添加1%的保护性脂肪（PF）；添加1%维生素E（VE）；以及基于干物质（DM）按1:1混合PF和VE（MIX）。实验日粮在瘤胃缓冲液中于39°C孵育72小时，实验1设4个重复和3个空白。在实验2中，将40头发情期的韩牛（胎次2.7±0.15）分配到每种日粮处理组。每个处理组由10头韩牛组成，分置于两个栏中单独饲养（每栏5头牛）。饲养期为75天，从人工授精（AI）前30天至人工授精后45天。在实验1中，日粮处理除了总挥发性脂肪酸（VFA）浓度外，对瘤胃养分消化率或发酵特性没有影响。日粮PF的总VFA浓度高于CON（P<0.05）。在实验2中，日粮PF和MIX使韩牛血液中的饱和脂肪酸浓度更高（P<0.05），而日粮VE和MIX使维生素E浓度更高（P<0.05）。所有添加日粮处理的韩牛血液中雌激素浓度均较低（P<0.05）。所有添加日粮处理的人工授精次数均较低（P<0.05），从而使韩牛的妊娠率更高（P<0.05）。本研究发现，单独或联合添加PF和维生素E对发情期韩牛的繁殖性能有有益影响。
