Effects of Energy Level of Concentrate Supplement on Performance and Nutrient Apparent Digestibility of Early-Weaner Yak Calves

YANG Jun; WANG Zhisheng; BAO Shanke; WANG Wei; XUE Bai; ZHANG Haibo; ZOU Huawei

doi:10.3969/j.issn.1006-267x.2013.09.014

2013 , Vol. 25 >Issue 9: 2021 - 2027

DOI: https://doi.org/10.3969/j.issn.1006-267x.2013.09.014

Ruminant Nutrition

Effects of Energy Level of Concentrate Supplement on Performance and Nutrient Apparent Digestibility of Early-Weaner Yak Calves

YANG Jun ,
WANG Zhisheng ,
BAO Shanke ,
WANG Wei ,
XUE Bai ,
ZHANG Haibo ,
ZOU Huawei

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1. Institute of Animal Nutrition, Sichuan Agricultural University, Key laboratory for Animal Disease-Resistance Nutrition of China Ministry of Education, Ya'an 625014, China;
2. Animal Husbandry and Veterinary Institute of Haibei State in Qinghai Province, Haibei 810299, China

Received date: 2013-03-01

Online published: 2013-08-18

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Abstract

This experiment was conducted to investigate the effects of energy level of concentrate supplement on performance, serum biochemical parameters and nutrient apparent digestibility of early-weaner yak calves. Eighteen healthy 3-month-old yak calves with an average body weight of (56.27?4.70) kg were randomlves allocated to 3 groups with 3 replicates per group and 2 calves per replicate. Calves were fed concentrate supplements with the same crude protein content (17.00%) and different net energy for gain (NE_g) levels (5.60, 6.50 and 7.40 MJ/kg, respectively) for 39 days (7-day pretrial period, 28-day feeding trial and 4-day digestion trial). The results showed as follows: 1) the average daily gain of yak calves in 6.50 and 7.40 MJ/kg groups was significantly higher than that in 5.60 MJ/kg group (P<0.05); the concentrate supplement/gain of yak calves in 5.60 MJ/kg group was significantly higher than that in 6.50 and 7.40 MJ/kg groups (P<0.05). 2) The contents of serum glucose and triglyceride in 6.50 MJ/kg group were significantly higher than those in 5.60 MJ/kg group (P<0.05), but were not significantly different from those in 7.40 MJ/kg group (P>0.05). 3) Dry matter, organic matter and gross energy apparent digestibility in 6.50 MJ/kg group were significantly higher than those in 5.60 MJ/kg group (P<0.05); calcium (P=0.06) and phosphorus apparent digestibility (P=0.10) tended to be decreased with the increase of energy level. Overall, yak calves can be weaned at 3 months of age when the NE_g of concentrate supplement is 6.50 MJ/kg, which is beneficial for nutrient digestion and body growth.

Key words： energy level; yak calf; performance; serum biochemical parameter; apparent digestibility

Cite this article

YANG Jun , WANG Zhisheng , BAO Shanke , WANG Wei , XUE Bai , ZHANG Haibo , ZOU Huawei . Effects of Energy Level of Concentrate Supplement on Performance and Nutrient Apparent Digestibility of Early-Weaner Yak Calves[J]. Chinese Journal of Animal Nutrition, 2013 , 25(9) : 2021 -2027 . DOI: 10.3969/j.issn.1006-267x.2013.09.014

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