Molecular Nutrition

Effects of Dietary Nutrient Level on Growth Performance, Carcass Quality, Meat Quality, Flavor and Plasma Biochemical Parameters of Medium-Growing Yellow-Feathered Broilers

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  • Institute of Animal Science, Guangdong Academy of Agricultural Sciences, State Key Laboratory of Livestock and Poultry Breeding, Key Laboratory of Animal Nutrition and Feed Science in South China, Ministry of Agriculture Guangdong Public Laboratory of Animal Breeding and Nutrition, Guangdong Key Laboratory of Animal Breeding and Nutrition, Guangzhou 510640, China

Received date: 2018-05-25

  Online published: 2018-12-19

Abstract

This experiment was conducted to investigate the effects of dietary nutrient level on growth performance, carcass quality, meat quality, flavor and plasma biochemical parameters of medium-growing yellow-feathered broilers. A total of 1 920, 1 920 and 1 440 medium-growing Lingnan yellow-feathered broilers at 1, 29 and 57 days of age were selected, respectively. The experiment divided into 3 stages, at each stage, the low nutrient level group, medium nutrient level group and high nutrient level group were set up according to our research group standard up or down for yellow-feathered broilers, and the standard nutrient group was set up according to standard of Standard of Chicken Feeding (NY/T 33—2004). There were 6 replicates of male broilers in each group and 6 replicates of female broilers in each group, each replicate had 30 to 40 broilers. The experiment lasted for 84 days. The results showed as follows: 1) during 1 to 28 days of age, for male broilers, the average daily gain (ADG) of high nutrient level group was significantly higher than that of low nutrient level group and medium nutrient level group (P<0.05), the average daily feed intake (ADFI) of high nutrient level group and standard nutrient level group was significantly higher than that of low nutrient level group and medium nutrient level group (P<0.05), and the feed to gain ratio (F/G) of low nutrient level group was significantly higher than that of other nutrient level groups (P<0.05); for female broilers, the ADG of low nutrient level group was significantly lower than that of other nutrient level groups (P<0.05), the ADFI of standard nutrient level group was significantly higher than that of low nutrient level group (P<0.05), the F/G of medium nutrient level group was significantly lower than that of low nutrient level group (P<0.05). During 29 to 56 days of age, for male broilers, the F/G of low nutrient level group was significantly higher than that of other nutrient level groups (P<0.05); for female broilers, the ADG of low nutrient level group was significantly lower than that of other nutrient level groups (P<0.05), the ADFI of medium nutrient level group and standard nutrient level group was significantly higher than that of high nutrient level group (P<0.05), the F/G of low nutrient level group was significantly higher than that of high nutrient level group and standard nutrient level group (P<0.05). During 57 to 84 days, the ADG of male and female broilers of high nutrient level group was significantly higher than that of standard nutrient level group (P<0.05), and the F/G of female broilers of high nutrient level group was significantly lower than that of other nutrient level groups (P<0.05). 2) The abdominal fat rate of female broilers of standard nutrient level group was significantly lower than that of high nutrient level group (P<0.05). Dietary nutrient level had no significant effects on carcass rate, half-eviscerated rate, eviscerated rate, leg muscle rate, breast muscle rate and tibia breaking force of male and female broilers (P>0.05). 3) The 45 min yellowness value of meat color of male broilers of high nutrient level group was significantly lower than that of low nutrient level group and standard nutrient level group (P<0.05). Dietary nutrient level had no significant effects on tenderness, drip loss and pH of male broilers (P>0.05). Dietary nutrient level had no significant effects on meat quality indexes of female broilers (P>0.05). 4) Dietary nutrient level had no significant effects on flavor indexes of male and female broilers (P>0.05). 5) Dietary nutrient level had no significant effects on the contents of calcium, uric acid and urea nitrogen in plasma of male and female broilers (P>0.05). According to the results of growth performance, weight gain cost, carcass quality, meat quality and plasma biochemical indexes in this study, it is concluded that during 1 to 28 days of age, recommend medium nutrient level diet for male and female broilers; during 29 to 56 days of age, recommend medium nutrient level diet for male and female broilers; during 57 to 84 days of age, recommend high nutrient level diet for male and female broilers.

Cite this article

LIN Xiajing, GOU Zhongyong, LI Long, HUANG Danhong, FAN Qiuli, JIANG Shouqun . Effects of Dietary Nutrient Level on Growth Performance, Carcass Quality, Meat Quality, Flavor and Plasma Biochemical Parameters of Medium-Growing Yellow-Feathered Broilers[J]. Chinese Journal of Animal Nutrition, 2018 , 30(12) : 4907 -4921 . DOI: 10.3969/j.issn.1006-267x.2018.12.018

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