Effects of Dietary Energy Level on Slaughter Performance, Meat Quality and Serum Endogenous Hormone Contents of Jinjiang Steers in Early Stage of Fattening

BAI Jun, ZHAO Erlong, LI Yanjiao, LI Meifa, XIN Junping, YANG Shitang, YANG Jianjun, YI Zhonghua, QU Mingren, XU Lanjiao

doi:10.3969/j.issn.1006-267x.2019.03.021

2019 , Vol. 31 >Issue 3: 1163 - 1170

DOI: https://doi.org/10.3969/j.issn.1006-267x.2019.03.021

Molecular Nutrition

Effects of Dietary Energy Level on Slaughter Performance, Meat Quality and Serum Endogenous Hormone Contents of Jinjiang Steers in Early Stage of Fattening

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1. Engineering Research Center of Feed Development, Jiangxi Province Key Laboratory of Animal Nutrition, Jiangxi Agricultural University, Nanchang 330045, China;
2. National Beef Cattle Industrial Technology System of Gaoan Test Station, Gaoan 330800, China

Received date: 2018-08-05

Online published: 2019-03-18

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Abstract

This experiment was conducted to explore the effects of diet energy level on the slaughtering performance, meat quality and serum endogenous hormone contents of Jinjiang steers in early stage of fattening. Fifty Jinjiang steers with good body condition and similar body weight of (301.7±30.1) kg were randomly divided into 5 groups (groups A, B, C, D and E) with 10 heads in each group, and each group had 4 replicates with 2 to 3 steers per replicate. A basal diet was prepared by reference to China Beef Cattle Feeding Standard. Group A was fed the basal diet, and the combined net energy (NE_mf) levels of steers in groups B, C, D and E were increased by 6%, 12%, 18% and 24%, respectively, on the basis of the basal diet. The crude protein level of the 5 diets was consistent, and the NE_mf level of the 5 diets was 6.02 (group A), 6.38 (group B), 6.74 (group C), 7.10 (group D) and 7.46 MJ/kg (group E), respectively. After 116 days of feeding, the animals were forbidden to be fed for 12 h. For each group, three cows with body weight close to the average weight of that group were selected for slaughter to determine their slaughtering performance and meat quality. The results showed as follows:1) with the increase of the dietary NE_mf level, the backfat thickness of Jinjiang steers showed a trend of first decreasing and then rising, among which, the backfat thickness of Jinjiang steers in group C was the lowest (2.01 cm), while the eye muscle area gradually increased, and the maximum value of group E was 81.04 cm². 2) With the increase of the dietary NE_mf level, the pH_{45 min} of longissimus dorsi gradually decreased, and it in groups D and E was significantly lower than that in group A (P<0.05); the shear force of longissimus dorsi in groups C, D and E was significantly lower than that in groups A and B (P<0.05). However, dietary energy level had no significant effects on the pH_{24 h}, meat color[lightness (L^*), redness (a^*) and yellowness (b^*) values], dripping loss and cooking loss of longissimus dorsi (P>0.05). 3) The crude fat and crude protein contents in longissimus dorsi of Jinjiang steers in group C were significantly higher than those in the other groups (P<0.05), but there were no significant differences in the moisture and ash contents in longissimus dorsi of Jinjiang steers among groups (P>0.05). 4) The serum growth hormone content in group E was significantly higher than that in groups A, B and C (P<0.05). The serum leptin content in group C was significantly lower than that in groups A, B and D (P<0.05), and serum adiponectin content was significantly higher than that in other groups (P<0.05). In conclusion, under the conditions of this experiment, combined with the results of carcass traits, meat quality and serum endogenous hormone contents, the energy level of diet C (NE_mf level=6.74 MJ/kg) is relatively suitable for the energy level requirement for the production of high-quality beef of Jinjiang steers.

Key words： Jinjiang steers; energy level; slaughtering performance; meat quality

Cite this article

BAI Jun, ZHAO Erlong, LI Yanjiao, LI Meifa, XIN Junping, YANG Shitang, YANG Jianjun, YI Zhonghua, QU Mingren, XU Lanjiao . Effects of Dietary Energy Level on Slaughter Performance, Meat Quality and Serum Endogenous Hormone Contents of Jinjiang Steers in Early Stage of Fattening[J]. Chinese Journal of Animal Nutrition, 2019 , 31(3) : 1163 -1170 . DOI: 10.3969/j.issn.1006-267x.2019.03.021

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