The effect of tissue mobilization and stage of lactation on energy partitioning in lactating sows: an analysis of commercial data

Josep Gasa, S. Capalbo, Jennifer Ellis, David Sola, James France
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Abstract

The objective of this paper was to investigate how the predicted level of body energy mobilized and the stage of lactation affects performance and energy partitioning in lactating sows kept under commercial conditions. Seventy-seven lactating sows from three consecutive batches were weaned at 28 d and all measures were taken over the first 20 d. Total feed consumption was measured and sows’ live weight was registered when entering the lactation facilities and at 21 d of lactation. Blood samples were collected at farrowing and once a week thereafter. Net energy (NE) mobilization or loss was calculated by difference using the general NRC equation for ME partitioning. Compared to low mobilizers (low NE loss values), high mobilizing sows had lower feed intake and higher loss of live weight, body fat and body protein. High mobilizers also weaned more piglets and had heavier litters than low mobilizers. Energy mobilization (NE loss) was higher from day 1 to 10 of lactation compared to day 11 to 20, and the difference in mobilized energy between high and low mobilizing sows was also higher in the first than in the second half of lactation. Body weight and back fat thickness losses were significantly correlated with NE loss. A more accurate prediction of the changes in live weight or back fat thickness over lactation should help better predict total amount of energy mobilized, and more research is needed to assess the relative contribution of lean and fat to mobilized tissue.
组织动员和泌乳阶段对泌乳母猪能量分配的影响:商业数据分析
本研究旨在探讨在商业条件下饲养的泌乳母猪,机体能量动员水平和泌乳阶段对其生产性能和能量分配的影响。连续3批77头泌乳母猪在28 d断奶,在前20 d采取所有措施。在进入泌乳设施和泌乳21 d时测量总饲料消耗量并登记母猪活重。产时采集血样,此后每周采集一次。净能(NE)的调动或损失是用通用的NRC方程来计算的。与低动员母猪(低NE损失值)相比,高动员母猪采食量更低,活重、体脂和体蛋白损失更高。与低动员者相比,高动员者断奶仔猪更多,产仔更重。能量动员(NE损失)在泌乳第1 ~ 10天高于第11 ~ 20天,且高动员母猪和低动员母猪在泌乳第1 ~ 10天的动员能差异也高于泌乳第11 ~ 20天。体重和背部脂肪厚度损失与NE损失显著相关。更准确地预测哺乳期间活重或背部脂肪厚度的变化有助于更好地预测动员的总能量,需要更多的研究来评估瘦肉和脂肪对动员组织的相对贡献。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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