Impact of metabolic status of sows around the farrowing on stillbirth, pre-weaning mortality and as diagnostic tools of the metabolic state of lactating sows

本研究的目的是探讨母猪的代谢状况及分娩前后的营养策略对泌乳母猪生产性能的影响。具体而言，目的是1-评价与分娩持续时间和分娩间隔相关的饮食 ** 策略对死胎发生率的影响; 2-确定分娩前后以及 ** 哺乳期间泌乳母猪的代谢状态与哺乳期间窝仔生长、泌乳母猪的采食量和下一窝仔的生殖 ** 性能之间的 ** 关系; 3-从母猪的代谢状态和身体参数开发模型，以 ** 预测下一窝的采食量、窝仔生长和繁殖性能。事实上，即使已知 ** 泌乳母猪的采食量会影响其产仔性能和长期繁殖性能，但母猪的代谢状态（脂质和蛋白质动员以及葡萄糖利用）对采食量的 ** 影响尚不清楚。母猪分娩前的状况，如过度脂肪沉积和便秘，已知会影响分娩过程，以及每窝死胎和活仔猪，但其他因素，如钙状态，可能会影响子宫收缩，然后难产，可能会在分娩过程中决定，然后在分娩前后决定仔猪的存活率。本项目所获得的结果将对 ** 母猪的生产性能产生短期和长期的影响，包括减少死胎、提高仔猪存活率和窝仔生长率。本项目还将 ** 开放几个调查领域，以便了解哺乳母猪饲料 ** 摄入量的潜在控制机制，这是窝产性能和长期生殖 ** 性能的决定因素。最后，本计画将借由发展新的预测模式，以协助更有效地利用农场资源，并发展农场技术，以维持加拿大养猪业的竞争力。

The general purpose of this project is to study metabolic status of sows and nutritional strategy around the**farrowing on lactating sow performances. Specifically, the objectives are 1- to evaluate the effect of dietary**strategy on incidence of stillbirth in relation with duration of farrowing and birth interval; 2- to determine the**relationship between the metabolic status of the lactating sow before and after farrowing as well as during**lactation, and the growth of the litter during lactation, feed intake of lactating sows and reproductive**performance at the next litter; 3- to develop a model from metabolic status and body parameters of sows to**predict feed intake, litter growth and reproductive performance at the next litter. In fact, even if it is known that**feed intake of lactating sows can affect their litter performances and long-term reproductive performances, the**effect of metabolic status (lipid and protein mobilisation and glucose utilization) of sows on the feed intake are**not clearly known. The pre-farrowing conditions of sows, like over fat deposition and constipation, are known**to affect farrowing process, and stillbirth and alive piglets per litter, but other factors, as calcium status, which**could affect uterine contraction and then dystocia, may be determining in farrowing process and then piglet**survival around the farrowing. The results obtained in this project will have a short and long-term impact on**sow performances, including a reducing stillbirth, better piglet survival and litter growth. This project will also**open several areas of investigation that will allow to understand the underlying control mechanisms of feed**intake in lactating sows, which is a determining factors of litter performances and long-term reproductive**performances. Finally, by developing new predicting model this project will contribute to using more**efficiently farm resources and develop farming techniques to maintain the competitiveness of Canadian swine**industry.