Effect of Supplementary Feed on Growth Performance, Serum Biochemical Indices and Economic Benefit of Grazing Yaks in Cold Season

doi:10.11924/j.issn.1000-6850.casb2021-0567

Abstract

Abstract:

This experiment was conducted to evaluate the effect of supplementary feed on growth performance and blood biochemical indexes of grazing yak in cold season. A total of 120 healthy yaks were selected and randomly divided into 8 groups including 1 grazing group (control) and 7 supplemental groups (grazing + supplementary feed). The experiment lasted for 120 days with the beginning of 7 days for adaptation. The results showed that average daily gain was significantly increased for supplementary feed group compared to grazing group (P<0.05). Meanwhile, the average daily gain was linearly increased with the increase of supplemental levels (P<0.05). However, serum biochemical indices were not significantly affected by supplementary feed (P>0.05), indicating that nutrients’ digestion and absorption were not negatively affected. There were significant differences in net income for energy supplement between supplemental group and grazing group (P<0.05), which was 4.93 Yuan and 1.69 Yuan per head, respectively, and supplemental group had 388.80 Yuan more during the total experimental period. Meanwhile, net income was the highest at 0.4% supplemental level, 247.20 Yuan more than the grazing group. In summary, the growth performance and economic benefit could be improved by supplementary feed without adverse effect on animal health in cold season.

Key words: supplementary feed in cold season, grazing yak, growth performance, serum biochemical indices

CLC Number:

S815.4

WU Hao, HAI Peng, GUO Fei, CAN Muyou. Effect of Supplementary Feed on Growth Performance, Serum Biochemical Indices and Economic Benefit of Grazing Yaks in Cold Season[J]. Chinese Agricultural Science Bulletin, 2022, 38(20): 105-111.

Figures/Tables 8

References 34

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	DM/%	CP/%	Ca/%	P/%	NE_g/(MJ/kg)
压片玉米	86.0	9.4	0.09	0.27	7.00
棉籽粕	88.0	44.0	0.26	2.28	4.70
玉米秸秆	40.0	5.6	0.40	0.08	2.44

	DM/%	CP/%	Ca/%	P/%	NE_g/(MJ/kg)
压片玉米	86.0	9.4	0.09	0.27	7.00
棉籽粕	88.0	44.0	0.26	2.28	4.70
玉米秸秆	40.0	5.6	0.40	0.08	2.44

项目	补饲饲料类型
项目	能量料	蛋白料	混合料
原料组成（干物质基础）
压片玉米/%	38.97	0.00	26.03
棉籽粕/%	0.00	40.06	13.59
玉米秸秆/%	61.03	59.94	60.53
营养成分（干物质基础）
DM/%	57.93	59.23	58.56
CP/%	7.08	20.98	11.82
Ca/%	0.28	0.34	0.30
P/%	0.15	0.96	0.43
NE_g/(MJ/kg)	4.22	3.35	3.94

项目	补饲饲料类型
项目	能量料	蛋白料	混合料
原料组成（干物质基础）
压片玉米/%	38.97	0.00	26.03
棉籽粕/%	0.00	40.06	13.59
玉米秸秆/%	61.03	59.94	60.53
营养成分（干物质基础）
DM/%	57.93	59.23	58.56
CP/%	7.08	20.98	11.82
Ca/%	0.28	0.34	0.30
P/%	0.15	0.96	0.43
NE_g/(MJ/kg)	4.22	3.35	3.94

指标	补饲料类型				SEM	P值
指标	放牧组	能量组	蛋白组	混合组	SEM	P值
动物头数	15	15	15	15	-	-
体重/kg
初始体重	94.6	92.7	103.7	91.0	6.764	0.556
30天终末体重	95.1	100.6	108.9	97.9	7.173	0.562
60天终末体重	91.3	106.8	114.0	101.3	7.705	0.215
120天终末体重	102.7	126.0	128.9	116.7	8.200	0.117
日增重/kg
0~30天	0.02^b	0.27^a	0.17^a	0.23^a	0.551	0.013
30~60天	-0.13^B	0.20^A	0.17^A	0.11^A	0.058	<0.001
0~60天	-0.06^B	0.24^A	0.17^A	0.17^A	0.047	<0.001
60~120天	0.19	0.32	0.25	0.26	0.036	0.100
0~120天	0.07^B	0.28^A	0.21^A	0.22^A	0.027	<0.001