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当前位置: 首页 > 文章 > Different dietary methionine to lysine ratios in the lactation diet: effects on the performance of sows and their offspring and methionine metabolism in lactating sows 畜牧与生物技术杂志(英文版) 2019,10 (1)
Position: Home > Articles > Different dietary methionine to lysine ratios in the lactation diet: effects on the performance of sows and their offspring and methionine metabolism in lactating sows Journal of Animal Science and Biotechnology 2019,10 (1)

Different dietary methionine to lysine ratios in the lactation diet: effects on the performance of sows and their offspring and methionine metabolism in lactating sows

作  者：
Hong Wei;Zhao Xitao;Xia Mao;Chengquan Tan;Jun Gao;John K Htoo;Chong Xu;Jian Pen
单  位：
Department of Animal Nutrition and Feed Science, College of Animal Science and Technology, Huazhong Agricultural University, Wuhan, People’s Republic of China;Evonik Degussa (China) Co., Ltd, Beijing, People’s Republic of China; The Cooperative Innovation Center for Sustainable Pig Production, Wuhan, People’s Republic of Chin; Department of Animal Nutrition and Feed Science, College of Animal Science, South China Agricultural University, Guangzhou, People’s Republic of China;Evonik Nutrition & Care GmbH, Essen, Germany;Department of Animal Nutrition and Feed Science, College of Animal Science, South China Agricultural University, Guangzhou, People’s Republic of China
关键词：
Lactation;Met to Lys ratios;Methionine;Oxidative stress;Piglet growth performance;Sow performanc
摘  要：
Background Over the last decade, the nutritional requirements of lactating modern genotype sows have increased. The current nutritional recommendations might be unable to meet the needs of increased litter size and milk production, and thus the nutritional requirements need to be re-evaluated. The current study was conducted to investigate the effects of dietary methionine to lysine (Met:Lys) ratios on the performance of and methionine metabolism in lactating sows. Results During the 1(st) week of lactation, piglets reared on sows in the 0.37 to 0.57 Met:Lys ratio groups grew faster than those reared on sows in the control group (0.27) (P < 0.01). The 0.37-ratio group showed increased levels of GSH-Px in plasma during lactation (P < 0.01) and decreased concentrations of urea nitrogen in the plasma of sows (P < 0.05). Compared with the 0.27-ratio group, the levels of T-AOC and GSH-Px in the plasma and homocysteine in the milk of lactating sows were significantly increased in sows in the 0.47-ratio group (P < 0.01). In sows fed a 0.57-ratio diet, the levels of glutathione and taurine in the plasma and milk were improved significantly during lactation. However, the content of TBARS in the blood (P < 0.05 at day 7 and P = 0.06 at weaning day) was increased (P < 0.01). Moreover, there were linear increases in the levels of homocysteine in the blood and milk of sows during the lactation period (P < 0.01) with increased dietary Met:Lys ratios in the lactation diet. Conclusions The current study indicated that increasing the dietary Met:Lys ratio (0.37-0.57) in the lactation diet had no significant effect on the overall performance of sows or the colostrum and milk composition, but it increased piglet mean BW and piglet ADG during the first week of lactation. Increasing dietary methionine levels had no significant effect on antioxidant function in lactation sows, even though it increased levels of GSH and GSH-Px in the plasma of sows during lactation. However, the content of homocysteine in the plasma and milk increased during lactation due to a high level of dietary methionine.

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