title: Effects of the standardized ileal digestible valine : lysine ratio on performance, milk composition and plasma indices of lactating sows.
abstract: To determine the effects of standardized ileal digestible (SID) valine : lysine ratio on the performance, milk composition and plasma indices of lactating sows, 32 Large White × Landrace sows (219.78 ± 7.15 kg body weight; parity 1.82 ± 0.62) were allotted to one of four dietary treatments with eight sows per treatment based on parity, back fat thickness and body weight. The sows were fed corn-soybean meal-based diets containing 63, 83, 103 or 123% SID valine : lysine from day 107 of gestation until day 28 of lactation. The average daily feed intake of sows and daily weight gain of piglets increased linearly (P < 0.05) while back fat loss decreased linearly (P < 0.05) as the SID valine : lysine ratio increased. All of the analyzed amino acids in sow colostrum and valine concentrations of sow and piglet plasma increased linearly (P < 0.05) with the increasing SID valine : lysine ratio. In conclusion, 88 and 113% dietary SID valine : lysine ratios were optimal to achieve minimum back fat loss and maximum piglet growth rate using a linear-break point model which exceeds the requirement of 85% that is estimated by the National Research Council (2012).
authors.affiliation: State Key Laboratory of Animal Nutrition, Ministry of Agriculture Feed Industry Centre, China Agricultural University, Beijing, China.
authors.forename: Yetong
authors.initials: Y
authors.lastname: Xu
authors.affiliation: State Key Laboratory of Animal Nutrition, Ministry of Agriculture Feed Industry Centre, China Agricultural University, Beijing, China.
authors.forename: Zhikai
authors.initials: Z
authors.lastname: Zeng
authors.affiliation: State Key Laboratory of Animal Nutrition, Ministry of Agriculture Feed Industry Centre, China Agricultural University, Beijing, China.
authors.forename: Xiao
authors.initials: X
authors.lastname: Xu
authors.affiliation: State Key Laboratory of Animal Nutrition, Ministry of Agriculture Feed Industry Centre, China Agricultural University, Beijing, China.
authors.forename: Qiyu
authors.initials: Q
authors.lastname: Tian
authors.affiliation: State Key Laboratory of Animal Nutrition, Ministry of Agriculture Feed Industry Centre, China Agricultural University, Beijing, China.
authors.forename: Xiaokang
authors.initials: X
authors.lastname: Ma
authors.affiliation: State Key Laboratory of Animal Nutrition, Ministry of Agriculture Feed Industry Centre, China Agricultural University, Beijing, China.
authors.forename: Shenfei
authors.initials: S
authors.lastname: Long
authors.affiliation: Animal Science and Technology College, Beijing University of Agriculture, Beijing, China.
authors.forename: Meijing
authors.initials: M
authors.lastname: Piao
authors.affiliation: Animal Science and Technology College of Yunnan Agricultural University, Kunming, China.
authors.forename: Zhibin
authors.initials: Z
authors.lastname: Cheng
authors.affiliation: State Key Laboratory of Animal Nutrition, Ministry of Agriculture Feed Industry Centre, China Agricultural University, Beijing, China.
authors.forename: Xiangshu
authors.initials: X
authors.lastname: Piao
mesh_terms: D000821:Animal Feed / Q000032:analysis*; D000818:Animals; D003126:Colostrum / Q000737:chemistry; D004032:Diet / Q000662:veterinary*; D004435:Eating; D005260:Female; D007774:Lactation / Q000502:physiology*; D008239:Lysine / Q000032:analysis*; D008892:Milk / Q000737:chemistry*; D013552:Swine / Q000097:blood / Q000254:growth & development* / Q000502:physiology*; D014633:Valine / Q000032:analysis*; D015430:Weight Gain
chemical_list: D014633:Valine; D008239:Lysine
keywords: milk components; performance; plasma amino acids; sow; valine : lysine ratio