PDF(Pubmed)
Abstract：
We aimed to understand the changes in nutritional parameters and performance of beef cows during the peripartum, whether receiving or not receiving protein supplements. Forty cows were used, divided into two treatments: CON-mineral mix and SUP-protein supplementation. Digestibility trial was performed at 45, 30, and 15 days (d) before the parturition and at 20 and 40 d of lactation. The ADG of cows pre- and postpartum was recorded along with the BCS in gestational (GT) and maternal (MT) tissues in the prepartum. There was an effect of treatment and period (p ≤ 0.044) for intakes of DM and CP. The forage intake was similar (p > 0.90) but varied with the effect of days related to parturition (p < 0.001). There was a 14.37% decrease in DM intake from d -30 to d -15 of prepartum. In the postpartum, at 20 d of lactation, there was an increase of 72.7% in relation to d -15 of prepartum. No differences were observed in postpartum ADG or BCS at parturition and postpartum (p ≥ 0.12). However, higher total and MT ADG (p ≤ 0.02) were observed in animals receiving supplementation, while ADG in GT remained similar (p > 0.14). In conclusion, there is a decrease in intake for pregnant cows close to parturition and greater performance of animals supplemented in prepartum.
摘要：
我们旨在了解围产期肉牛营养参数和性能的变化，是否接受蛋白质补充剂。使用了40头牛，分为两种治疗：CON-矿物质混合物和SUP-蛋白质补充。消化率试验在分娩前45、30和15天（d）以及哺乳期20和40天进行。记录奶牛产前和产后的ADG以及产前的妊娠（GT）和母体（MT）组织中的BCS。DM和CP的摄入有治疗和时间（p≤0.044）的影响。饲草摄入量相似（p>0.90），但随分娩天数的影响而变化（p<0.001）。从产前的d-30到d-15，DM摄入量减少了14.37％。在产后，在哺乳期20天，与产前的d-15相比，增加了72.7%。产后ADG或BCS在分娩和产后没有观察到差异（p≥0.12）。然而,在接受补充的动物中观察到较高的总ADG和MTADG（p≤0.02），而GT中的ADG保持相似(p>0.14)。总之,接近分娩的怀孕母牛的摄入量减少，而在产前补充的动物的表现更高。
