Effects of Dietary Concentrate Level and Chromium Methionine Adding Dosage on Growth Performance, Carcass Characteristics, Meat Quality and Fat Deposition of Stabling Tan Lambs

JIN Yadong; JIA Rou; ZHOU Yuxiang; MA Qing

doi:10.3969/j.issn.1006-267x.2021.02.030

2021 , Vol. 33 >Issue 2: 888 - 899

DOI: https://doi.org/10.3969/j.issn.1006-267x.2021.02.030

Effects of Dietary Concentrate Level and Chromium Methionine Adding Dosage on Growth Performance, Carcass Characteristics, Meat Quality and Fat Deposition of Stabling Tan Lambs

JIN Yadong ,
JIA Rou ,
ZHOU Yuxiang ,
MA Qing

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1. College of Agriculture in Ningxia University, Yinchuan 750021, China;
2. Research Center of Grass and Livestock, Ningxia Academy of Agriculture and Forestry Science, Yinchuan 750002, China

Received date: 2020-07-05

Online published: 2021-02-04

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Abstract

This experiment was conducted to evaluate the effects of dietary concentrate level and chromium methionine (Cr-Met) adding dosage on the growth performance, carcass characteristics, meat quality and fat deposition of stabling Tan lambs. A 2×3 two-factor factorial design was adopted in this experiment. Factor 1 was dietary concentrate level, and it was 35% (low concentrate diet, dietary concentrate-to-forage ratio was 35:65) and 55% (high concentrate diet, dietary concentrate-to-forage ratio was 55:45), respectively. Factor 2 was Cr-Met adding dosage, and it was 0, 0.75 and 1.50 g/(d·lamb), respectively. Sixty male Tan lambs [average body weight: (21±1) kg] were randomly assigned into 6 trial groups with 10 lambs per group. The experimental period was 80 days containing 15-day pre-experiment and 65-day formal experiment. The results showed as follows: 1) compared with low concentrate diet group, the average daily gain, dressing percentage, backfat thickness, intramuscular fat content and leg proportion of lambs from the high concentrate diet group were significantly increased (P<0.05), but the feed/gain and muscle cooking loss, shear force, pH, lightness (L^*) value, redness (a^*) value and yellowness (b^*) value were significantly decreased (P<0.05). 2) Lambs from the low concentrate diet group, there was a linear decrease in backfat thickness, subcutaneous fat thickness, intramuscular fat content and leg proportion (P<0.05), but a linear increase in muscle pH with increasing Cr-Met adding dosage (P<0.05). Lambs from the high concentrate diet group, the rib proportion, loin proportion and muscle shear force, and pH exhibited a linear increase (P<0.05), whereas the intramuscular fat content and muscle a^* value showed a linear decrease with increasing Cr-Met adding dosage (P<0.05). Considering all the measured indexes of this experiment, it is suggested that the optimum dietary concentrate-to-forage ratio for Tan lamp is 55:45, the optimum Cr-Met adding dosage is 1.50 g/(d·lamb) and it is not recommended in low concentrate diet.

Key words： stabling Tan lambs; chromium methionine; concentrate level; growth performance; meat quality; fat deposition

Cite this article

JIN Yadong , JIA Rou , ZHOU Yuxiang , MA Qing . Effects of Dietary Concentrate Level and Chromium Methionine Adding Dosage on Growth Performance, Carcass Characteristics, Meat Quality and Fat Deposition of Stabling Tan Lambs[J]. Chinese Journal of Animal Nutrition, 2021 , 33(2) : 888 -899 . DOI: 10.3969/j.issn.1006-267x.2021.02.030

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