Effect of tannin on growth performance, digestion and metabolism and slaughtering performance of fattening Tan sheep

doi:10.3969/j.issn.1004-1524.20221742

Acta Agriculturae Zhejiangensis ›› 2023, Vol. 35 ›› Issue (12): 2809-2817.DOI: 10.3969/j.issn.1004-1524.20221742

• Animal Science • Previous Articles Next Articles

Effect of tannin on growth performance, digestion and metabolism and slaughtering performance of fattening Tan sheep

WEN Hongrui(), QI Mingjiang, GAO Changpeng, TIAN Xiaoyu, LI Xuemei, ZHOU Yuxiang()

College of Animal Science and Technology, Ningxia University, Yinchuan 750021, China

Received:2022-12-04 Online:2023-12-25 Published:2023-12-27

Abstract

Abstract:

This experiment was conducted to investigate the effects of tannin on body size index, digestion and metabolism and slaughtering performance of fattening Tan sheep. Twenty-seven healthy male lambs with similar body weight were randomly divided into 3 groups with 9 lambs in each group. Tan sheep in three groups were fed with identical basic diets with different tannin levels: 0 (control group), 2 000 (trial group Ⅰ) and 4 000 mg·kg^-1 (trial group Ⅱ), respectively. The pre-trial period lasted for 10 days and the experimental period lasted for 60 days. The results showed that, compared with the control group, the dry matter intake of Tan sheep in trial group Ⅱ was significantly increased (P<0.01), and the total weight gain and average daily gain were significantly increased (P<0.05). Compared with the control group, the experimental group extremely significantly increased nitrogen intake, general energy intake and digestible energy (P<0.01), and significantly increased apparent digestibility of dry matter, deposited nitrogen, nitrogen deposition rate and apparent digestibility of general energy (P<0.05). Compared with the control group, the pre-slaughter live weight, carcass weight, net meat weight and eye muscle area of the experimental group were significantly increased (P<0.05). It is concluded that tannin supplementation can improve the growth performance, digestion metabolism and slaughtering performance of fattening Tan sheep, and the best effect is achieved at the supplemental level of 4 000 mg·kg^-1 under the experimental conditions, which can be widely used in production.

Key words: Tan sheep, tannin, growth, nitrogen metabolism, energy metabolism

CLC Number:

S826

WEN Hongrui, QI Mingjiang, GAO Changpeng, TIAN Xiaoyu, LI Xuemei, ZHOU Yuxiang. Effect of tannin on growth performance, digestion and metabolism and slaughtering performance of fattening Tan sheep[J]. Acta Agriculturae Zhejiangensis, 2023, 35(12): 2809-2817.

Figures/Tables 6

Table 1 Composition and nutrient levels of basal diets (dry matter basis)

项目Items	含量Content	营养指标Nutrient inde $x 2)$	营养水平Nutrient levels
青贮玉米Maize silage/%	15.00	代谢能Metabolizable energy/(MJ·kg^-1)²⁾	9.40
苜蓿干草Alfalfa hay/%	30.00	粗蛋白质Crude protein/%	12.39
玉米Corn grain/%	29.74	钙Ca/%	0.52
豆粕Soybean meal/%	14.50	磷P/%	0.36
麦麸Wheat bran/%	6.00	中性洗涤纤维Neutral detergent fiber/%	32.75
预混料Premi $x 1)$ /%	5.00	酸性洗涤纤维Acid detergent fiber/%	21.35
合计Total/%	100.00

Table 1 Composition and nutrient levels of basal diets (dry matter basis)

项目Items	含量Content	营养指标Nutrient inde $x 2)$	营养水平Nutrient levels
青贮玉米Maize silage/%	15.00	代谢能Metabolizable energy/(MJ·kg^-1)²⁾	9.40
苜蓿干草Alfalfa hay/%	30.00	粗蛋白质Crude protein/%	12.39
玉米Corn grain/%	29.74	钙Ca/%	0.52
豆粕Soybean meal/%	14.50	磷P/%	0.36
麦麸Wheat bran/%	6.00	中性洗涤纤维Neutral detergent fiber/%	32.75
预混料Premi $x 1)$ /%	5.00	酸性洗涤纤维Acid detergent fiber/%	21.35
合计Total/%	100.00

Fig.1 Effect of tannin on the growth performance of Tan sheep Letters at the top of the standard deviation indicates significant difference, different capital letters indicate extremely significant difference (P<0.01), and different lowercase letters indicate significant difference (P<0.05). The same as below.

Table 2 Effect of tannin on apparent digestibility of nutrients in Tan sheep

项目 Items	对照组 Control group	试验Ⅰ组 Trial group Ⅰ	试验Ⅱ组 Trial group Ⅱ	P值P value
项目 Items	对照组 Control group	试验Ⅰ组 Trial group Ⅰ	试验Ⅱ组 Trial group Ⅱ	处理 Treatment	线性 Linear	二次 Quadratic
干物质DM/%	60.16±3.77 b	67.39±3.01 a	67.76±1.67 a	0.033	0.020	0.150
中性洗涤纤维NDF/%	53.65±2.91	55.77±1.84	54.73±2.27	0.581	0.599	0.384
酸性洗涤纤维ADF/%	36.80±5.14	34.15±2.25	35.61±2.59	0.847	0.698	0.690

Table 3 Effect of tannin on nitrogen metabolism in fattening Tan sheep

项目 Items	对照组 Control group	试验Ⅰ组 Trial group Ⅰ	试验Ⅱ组 Trial group Ⅱ	P值P value
项目 Items	对照组 Control group	试验Ⅰ组 Trial group Ⅰ	试验Ⅱ组 Trial group Ⅱ	处理 Treatment	线性 Linear	二次 Quadratic
氮摄入量Nitrogen intake/(g·d^-1)	18.52±0.37 B	20.94±0.24 A	21.33±0.12 A	<0.001	<0.001	0.002
尿氮Urine nitrogen/(g·d^-1)	1.87±0.11	1.83±0.15	1.85±0.05	0.947	0.861	0.792
粪氮Fecal nitrogen/(g·d^-1)	6.94±0.34	6.95±0.65	7.05±0.34	0.956	0.796	0.896
总排出氮Total excreted nitrogen/(g·d^-1)	8.81±0.30	8.78±0.56	8.90±0.39	0.945	0.819	0.820
沉积氮Deposited nitrogen/(g·d^-1)	9.71±0.19 b	12.16±0.67 a	12.43±0.40 a	0.001	<0.001	0.016
氮表观消化率	62.53±1.13	66.81±3.18	66.96±1.60	0.076	0.046	0.225
Apparent nitrogen digestibility/%
氮沉积率Nitrogen deposition rate/%	52.43±0.90 b	58.04±2.82 a	58.28±1.80 a	0.019	0.012	0.107

Table 4 Effect of tannin on energy metabolism of fattening Tan sheep

项目 Items	对照组 Control group	试验Ⅰ组 Trial group Ⅰ	试验Ⅱ组 Trial group Ⅱ	P值P value
项目 Items	对照组 Control group	试验Ⅰ组 Trial group Ⅰ	试验Ⅱ组 Trial group Ⅱ	处理 Treatment	线性 Linear	二次 Quadratic
食入总能General energy intake/(MJ·d^-1)	13.70±0.38 B	15.71±0.36 A	16.07±0.30 A	<0.001	<0.001	0.004
粪能Fecal energy/(MJ·d^-1)	5.49±0.29	5.15±0.69	5.05±0.10	0.490	0.271	0.719
尿能Urinary energy/(MJ·d^-1)	2.51±0.29	2.47±0.34	2.40±0.33	0.920	0.699	0.955
消化能Digestible energy/(MJ·d^-1)	8.22±0.28 B	10.56±0.70 A	11.02±0.10 A	<0.001	<0.001	0.023
总能表观消化率	59.96±2.08 b	67.22±4.42 a	68.56±0.60 a	0.021	0.010	0.191
Apparent digestibility of general energy/%

Table 5 Effect of tannin on slaughter performance of fattening Tan sheep

项目 Items	对照组 Control group	试验Ⅰ组 Trial group Ⅰ	试验Ⅱ组 Trial group Ⅱ	P值P value
项目 Items	对照组 Control group	试验Ⅰ组 Trial group Ⅰ	试验Ⅱ组 Trial group Ⅱ	处理 Treatment	线性 Linear	二次 Quadratic
宰前活重Pre-slaughter live weight/kg	22.96±1.16 b	24.78±1.72 a	25.39±0.76 a	0.027	0.011	0.403
胴体重Carcass weight/kg	11.15±0.57 b	12.34±0.92 a	12.54±0.57 a	0.018	0.009	0.224
净肉重Net meat weight/kg	9.04±0.41 b	10.09±0.80 a	10.24±0.55 a	0.017	0.009	0.196
骨重Bone weight/kg	2.11±0.19	2.25±0.15	2.30±0.06	0.143	0.059	0.630
GR值GR value/mm	11.44±0.84	11.83±1.74	12.89±1.67	0.308	0.145	0.684
骨肉比Flesh and bone ratio	0.23±0.01	0.22±0.01	0.23±0.01	0.595	0.048	0.484
屠宰率Slaughter rate/%	48.80±1.09	49.80±1.48	49.40±1.14	0.468	0.463	0.327
胴体净肉率Net carcass meat rate/%	81.00±1.00	82.00±0.71	81.40±0.55	0.164	0.430	0.084
眼肌面积Eye muscle area/cm²	11.30±0.61 b	12.63±0.42 a	12.85±0.59 a	0.001	0.001	0.091

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Effect of tannin on growth performance, digestion and metabolism and slaughtering performance of fattening Tan sheep

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