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Effect of nutrient levels during the far-off period on postpartum productivity in dairy cows

机译：营养水平在乳房奶牛产后生产率期间的营养水平影响

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摘要

The present study aimed to determine the effects of differing nutrient levels during the far-off period on postpartum metabolism and milk production in lactating cows. Twenty-six multiparous cows were assigned to three dietary treatments in the far-off period: a low-energy diet (L, n = 9, 80% intake of the total digestible nutrients requirement), a moderate-energy diet (M, n = 8, 105%) and a high-energy diet (H, n = 9, 130%). During the close-up period, all cows were provided with 105% intake. After parturition, all cows were fed a lactation diet. The BCS recovery was slow, and low milk yield was found in the H group. In the L group, BCS recovery was favorable after parturition, and lactation persistence was increased. The L group had low rumen endotoxin activity and a high initial ovulation rate after parturition. These findings indicate that a high-energy diet during the far-off period has a deleterious effect on milk production. In contrast, the restricted diet in the far-off period increased adaptability with respect to peri-parturition metabolic changes, improved the post-parturition nutritional state, and increased milk production. Furthermore, it suggests that the nutrient levels in the far-off period affect rumen endotoxin activity and reproductive function after parturition.
机译：本研究旨在确定在哺乳奶牛产后代谢和牛奶生产中偏远期间营养水平的影响。在遥控期内分配了二十六个多体奶牛：低能量饮食（L，n = 9，80％摄入总消化营养需求），中等能量饮食（M，N = 8,105％）和高能饮食（H，N = 9,130​​％）。在特写期间，所有奶牛都有105％的摄入量。完成后，所有奶牛都被喂养了哺乳饮食。 BCS恢复缓慢，H组中发现了低牛奶产量。在L集团中，BCS恢复在份额后有利，并且增加了哺乳期持久性。 L组在分娩后的瘤胃内毒素活性较低，初始排卵率高。这些调查结果表明，偏远时期的高能量饮食对牛奶产量有害影响。相比之下，在突发期间的限制饮食增加了对围术代谢变化的适应性，改善了术后营养状态，增加了牛奶产量。此外，它表明，游击期间的营养水平会影响萌发后的内毒素活性和分娩后的生殖功能。

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