Effects of Diets with Different Fiber and Protein Levels on Digestion and Metabolism, Plasma Biochemical Indices and Body Weight Gain of 2 Years Old Yanqi Horse

LIU Kai; ZHAO Fang; LI Xiaobin; CHEN Xueji; Aersilin; YANG Kailun

doi:10.3969/j.issn.1006-267x.2016.06.037

2016 , Vol. 28 >Issue 6: 1935 - 1944

DOI: https://doi.org/10.3969/j.issn.1006-267x.2016.06.037

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Effects of Diets with Different Fiber and Protein Levels on Digestion and Metabolism, Plasma Biochemical Indices and Body Weight Gain of 2 Years Old Yanqi Horse

LIU Kai ,
ZHAO Fang ,
LI Xiaobin ,
CHEN Xueji ,
Aersilin ,
YANG Kailun

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1. Xinjiang Agricultural University, Xinjiang Key Laboratory of Meat & Milk Production Herbivore Nutrition, Urumqi 830052, China;
2. Mongolian Autonomous Prefecture Bayinguoleng Baoqi Stud Farm of Yanqi Horse, Yanqi 841100, China

Received date: 2015-12-10

Online published: 2016-06-27

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Abstract

This experiment mainly studied the effects of diets with different dietary fiber and protein levels on digestion and metabolism, plasma biochemical indices and body weight gain of 2 years old Yanqi horse, in order to provide the theoretical basis for scientific feeding of Yanqi horse. Twenty healthy Yanqi male horses with the age of 2 years and the average body weight of (254±14) kg were randomly divided into 2 groups, and each group had 6 horses. Used the method of staging group, trial groups Ⅰ and Ⅱ were arranged in stage 1, and trial groups Ⅲ and Ⅳ were arranged in stage 2. Horses in the 4 groups were fed diets with different fiber and protein levels (the levels of fiber and protein in the diets were 73.52% and 6.99%, 68.82% and 7.55%, 67.32% and 8.04%, 64.21% and 8.57%, respectively). The digestion and metabolism experiment lasted for 21 d, comprised a 15 d adaptation period and 6 d trial period. The results showed that the digestibility of nutrients of Yanqi horse all showed increasing trends with the dietary protein level increasing, the digestibility of dry matter (DM), organic matter (OM), calcium (Ca), phosphorus (P) of trail group Ⅳ was significantly higher than that in trial group Ⅰ(P<0.05). In aspect of energy metabolism, digestible energy (DE) and metabolism energy (ME) of Yanqi horse were increased by increasing the dietary protein level, but there were no significant differences among trial groups (P>0.05). In aspect of Ca and P metabolism, the intakes, retentions and retention rates of Ca and P and the outputs of feces Ca and feces P in trial groups Ⅱ, Ⅲ and Ⅳ were higher than those in trial group Ⅰ. Among them, the retention rates of Ca and P in trial group Ⅳ were increased by 44.34% (P<0.05) and 47.80% (P<0.05) compared with trial group Ⅰ, respectively. But increasing the dietary protein level had no significant effects on the contents of total protein (TP), albumin (ALB), globulin (GLB), urea nitrogen (UN) and glutamine (Gln) in plasma and body weight gain among all groups (P>0.05). Therefore, increasing the dietary protein level can improve nutrient digestibility and retention, but cannot affect plasma biochemical indices and body weight gain, and the optimal levels of fiber and protein in the diet are 64.21% and 8.57%, respectively.

Key words： diet; Yanqi horse; fiber; protein; digestion and metabolism; plasma biochemical indices; body weight gain

Cite this article

LIU Kai , ZHAO Fang , LI Xiaobin , CHEN Xueji , Aersilin , YANG Kailun . Effects of Diets with Different Fiber and Protein Levels on Digestion and Metabolism, Plasma Biochemical Indices and Body Weight Gain of 2 Years Old Yanqi Horse[J]. Chinese Journal of Animal Nutrition, 2016 , 28(6) : 1935 -1944 . DOI: 10.3969/j.issn.1006-267x.2016.06.037

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