Alvarenga Tharcilla I R C, Copping Katrina J, Han Xuemei, Clayton Edward H, Meyer Richard J, Rodgers Raymond J, McMillen I Caroline, Perry Viv E A, Geesink Geert
School of Rural and Environmental Science, University of New England, Armidale, NSW 2351, Australia.
Robinson Research Institute, School of Medicine, University of Adelaide, Adelaide, SA 5005, Australia.
Meat Sci. 2016 Nov;121:141-147. doi: 10.1016/j.meatsci.2016.06.006. Epub 2016 Jun 9.
Primiparous Santa Gertrudis heifers were used to evaluate the effects of gestational dietary protein content on meat quality traits of 20month old bull progeny (n=40). At -60d before AI, heifers were randomly allocated to HIGH or LOW protein diet (HPERI and LPERI). From 24dpc, half of each treatment group changed to an alternative post-conception HIGH or LOW protein diet (HPOST and LPOST). LPERI and LPOST diets resulted in higher shear force of the semitendinosus muscle than HPERI (P=0.053) and HPOST (P=0.003), respectively. Heat-soluble collagen in the semitendinosus muscle was lower (P=0.019) for LPERI than HPERI. Collagen and tenderness of the longissimus muscle were not affected by dam nutrition (P>0.05). Color, pH, sarcomere length, cooking loss, compression values, desmin and troponin-T degradation, fiber type, intramuscular fat and polyunsaturated fatty acid content were not affected by dam nutrition during the peri-conception and first trimester gestational period (P>0.05).
初产的圣格特鲁迪斯小母牛被用于评估妊娠期日粮蛋白质含量对20月龄公牛后代（n = 40）肉质性状的影响。在人工授精前60天，小母牛被随机分配到高蛋白或低蛋白日粮组（HPERI和LPERI）。从妊娠24天起，每个处理组的一半小母牛改为受孕后的高蛋白或低蛋白日粮（HPOST和LPOST）。LPERI和LPOST日粮组的半腱肌剪切力分别高于HPERI组（P = 0.053）和HPOST组（P = 0.003）。LPERI组半腱肌中的热溶性胶原蛋白低于HPERI组（P = 0.019）。背最长肌的胶原蛋白和嫩度不受母牛营养状况的影响（P>0.05）。在受孕前后和妊娠头三个月，母牛的营养状况对肉的颜色、pH值、肌节长度、蒸煮损失、压缩值、结蛋白和肌钙蛋白-T降解、纤维类型、肌内脂肪和多不饱和脂肪酸含量均无影响（P>0.05）。
