Molecular Nutrition

Study on Optimal Requirement of Standard Ileal Digestible Lysine for Rongchang Lactating Sows

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  • 1. Key Laboratory of Pig Industry Sciences, Ministry of Agriculture, Chongqing Key Laboratory of Pig Industry Sciences, Chongqing Academy of Animal Science, Chongqing 402460, China;
    2. Daxing Town Agricultural Service Center of Bishan District in Chongqing, Chongqing 402768, China

Received date: 2018-01-05

  Online published: 2018-07-20

Abstract

This experiment was conducted to investigate the effects of dietary lysine levels on the performance, blood indices and milk composition of Rongchang sows during the lactation, in order to estimate the standard ileal digestible lysine (SID Lys) requirement for Rongchang lactating sows. A total of 50 Rongchang sows (2 to 3 parities and proximity of descent) were divided randomly into 5 groups according to the body condition on the day 110 of gestation with 10 replicates in each group and 1 pig in each replicate. Sows in five groups were fed five diets with different SID Lys levels of 0.60% (group 1), 0.70% (group 2), 0.80% (group 3), 0.90% (group 4) and 1.00% (group 5), respectively. The lactation period was 28 days. The results showed as follows:1) increasing dietary SID Lys levels tended to decrease sow weight loss during lactation (P=0.068 9). High level of dietary SID Lys (1.00%) could significantly decrease the average daily gain of piglets during 1 to 14 days of age compared with 0.60% to 0.80% SID Lys (P<0.05), but had no effects on the growth of piglets during the 28-day lactation (P>0.05). 2) Serum urea nitrogen contents of sows at the 14th day of lactating declined variously with dietary SID Lys level increasing, and those in group 3 to group 5 were significantly lower than that in group 1 (P<0.05). Dietary SID Lys levels had no significant effects on serum levels of insulin, insulin-like growth factor-Ⅰ, luteinizing hormone and follicle-stimulating hormone of sows at the 28th day of lactation (P>0.05), but significantly influenced serum estradiol level which in group 4 was significantly higher than those in groups 1, 2 and 5 (P<0.05). Dietary SID Lys levels had no effects on colostrum composition (P>0.05), while the contents of solid of non-fat and protein and the milk density in influenced ordinary milk were increased variously with dietary SID Lys level increasing, and those in group 4 and group 5 were significantly higher than that in group 1 (P<0.05). Quadratic plot analysis of body weight loss, serum contents of urea nitrogen and estradiol indicates that dietary SID Lys requirement is from 0.83% to 0.89% for Rongchang lactating sows.

Cite this article

HUANG Jinxiu, WANG Ruisheng, JIANG Yadong, WANG Jing, XIAO Rong, JIANG Shan, LIU Zuohua, YANG Feiyun . Study on Optimal Requirement of Standard Ileal Digestible Lysine for Rongchang Lactating Sows[J]. Chinese Journal of Animal Nutrition, 2018 , 30(7) : 2501 -2509 . DOI: 10.3969/j.issn.1006-267x.2018.07.010

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