Shao Taoqi, McCann Joshua C, Shike Daniel W
Department of Animal Sciences, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA.
Animals (Basel). 2023 Jan 27;13(3):437. doi: 10.3390/ani13030437.
Strategic supplementation during late gestation has the potential to alter progeny performance. Mature fall-calving Simmental × Angus cows were used to evaluate the effects of late gestation supplementation of fatty acids to beef cows on cow performance, steer progeny growth performance during pre-weaning and backgrounding periods, and relative mRNA expression of genes associated with myogenesis and adipogenesis. Cows (n = 190; 4 pasture groups of cows/treatment) grazed endophyte-infected tall fescue and were supplemented during late gestation with calcium salts of either saturated fatty acid/monounsaturated fatty acid (SFA/MUFA), polyunsaturated fatty acid (PUFA), or an isocaloric and isonitrogenous control (CON). There were no differences ( ≥ 0.11) in cow body weight (BW) or body condition scores from pre-supplementation to weaning or steer BW at birth, weaning, or at the end of the backgrounding period. Concentrations of C18:2n-6 in plasma were greater ( = 0.01) in SFA/MUFA and PUFA cows compared to CON cows during supplementation. For mRNA expression in the longissimus muscle of steer progeny from birth to weaning: PAX7 decreased to a greater ( < 0.01) extent for SFA/MUFA and PUFA steers; AGPAT1 and CPT1 increased to a greater ( ≤ 0.02) extent for CON steers. The expression of MYH7 mRNA during the pre-weaning period was greater ( = 0.01) in PUFA. In conclusion, late gestation fatty acid supplementation modified plasma relative concentrations of fatty acids for dams and progeny and modified mRNA expression of genes related to myogenesis and adipogenesis but had limited effects on progeny growth performance during pre-weaning and backgrounding periods.
妊娠后期进行策略性营养补充有可能改变后代的性能。选用成熟的秋季产犊西门塔尔×安格斯母牛，以评估妊娠后期给肉牛补充脂肪酸对母牛性能、断奶前和育肥前期阉牛后代生长性能以及与肌生成和脂肪生成相关基因的相对mRNA表达的影响。母牛（n = 190；每组4个牧场的母牛/处理）放牧感染内生菌的高羊茅，并在妊娠后期补充饱和脂肪酸/单不饱和脂肪酸（SFA/MUFA）、多不饱和脂肪酸（PUFA）的钙盐或等热量、等氮的对照物（CON）。从补充营养前到断奶期间，母牛体重（BW）或体况评分，以及出生、断奶或育肥期末阉牛的BW均无差异（≥0.11）。在补充营养期间，SFA/MUFA和PUFA组母牛血浆中C18:2n-6的浓度高于CON组母牛（P = 0.01）。对于出生至断奶的阉牛后代背最长肌中的mRNA表达：SFA/MUFA和PUFA阉牛的PAX7下降幅度更大（P < 0.01）；CON阉牛的AGPAT1和CPT1增加幅度更大（P≤0.02）。PUFA组在断奶前MYH7 mRNA的表达更高（P = 0.01）。总之，妊娠后期补充脂肪酸改变了母畜和后代血浆中脂肪酸的相对浓度，改变了与肌生成和脂肪生成相关基因的mRNA表达，但对断奶前和育肥前期后代的生长性能影响有限。
