Effect of Dietary Non-Phytate Phosphorus Level on Reproduction Performance, Tibial Indexes and Plasma Biochemical Indexes of Yellow-Feathered Broiler Breeders Aged from 39 to 46 Weeks

JIANG Shouqun, JIANG Zongyong, ZHENG Chuntian, DING Fayuan, RUAN Dong

doi:10.3969/j.issn.1006-267x.2015.02.028

2015 , Vol. 27 >Issue 2: 559 - 568

DOI: https://doi.org/10.3969/j.issn.1006-267x.2015.02.028

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Effect of Dietary Non-Phytate Phosphorus Level on Reproduction Performance, Tibial Indexes and Plasma Biochemical Indexes of Yellow-Feathered Broiler Breeders Aged from 39 to 46 Weeks

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Guangdong Key Laboratory of Animal Breeding and Nutrition, Guangdong Public Laboratory of Animal Breeding and Nutrition, The Key Laboratory of Animal Nutrition and Feed Science (South China) of Ministry of Agriculture, Institute of Animal Science, Guangdong Academy of Agricultural Sciences, Guangzhou 510640, China

Received date: 2014-09-15

Online published: 2015-02-09

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Abstract

This experiment was conducted to investigate the effects of dietary non-phytate phosphorus (NPP) level on reproduction performance, tibial indexes and plasma biochemical indexes of yellow-feathered broiler breeders aged from 39 to 46 weeks, and in order to determine the suitable phosphorus allowance of this phase. Eight hundred and ten 39-week-old parent Lingnan yellow-feathered broiler breeder hens were randomly assigned to 5 groups. Each group had 6 replicates with 27 birds per replicate. Group 1 was the control group, in which the birds were fed a corn-soybean meal basal diet with 0.30% NPP. Dietary NPP levels in groups 2 to 5 were adjusted to 0.35%, 0.40%, 0.45% and 0.50% from the basal diet, respectively; all other nutrient levels were identical. Birds were fed 122 g of diet per bird per day and watered ad libitum during the experimental period of 8 weeks. The results showed as follows: 1) dietary NPP level had no significant effects on average daily gain, average daily egg mass, the ratio of feed to egg, average egg weight, broken egg rate (P>0.05), had significant effects on laying rate and unqualified egg rate (P<0.05). Broiler breeders fed 0.45% NPP had a higher laying rate than those fed 0.30% and 0.40% NPP (P<0.05). Unqualified egg rate of 0.40% group was significantly lower than the other 4 groups (P<0.05). 2) There were significant influences of dietary NPP level on long diameter, short diameter, shape index, and eggshell strength of eggs produced during the period of 39 to 40 weeks (P<0.05), and eggshell strength of eggs from 45 to 46 weeks (P<0.05). 3) Dietary NPP level had no significant effect on hatching performance (fertilization rate, hatchability, salable chick rate and average salable chick birth weight) (P>0.05). 4) The contents of calcium and phosphorus in dry defatted tibial ash were significantly increased by dietary NPP supplementation (P<0.05). 5) The contents in plasma of parathyroid hormone was significantly higher in birds fed diets containing 0.40% and 0.45% NPP than in those of 0.30% and 0.35% NPP (P<0.05) and calcitonin was higher in birds fed 0.50% NPP than all other NPP levels (P<0.05). The results indicate that the optimal dietary NPP level for yellow-feathered broiler breeders aged from 39 to 46 weeks is 0.40% to 0.45%, equivalent to 0.488 to 0.549 g/d on the basis of calculated by feed intake.

Key words： non-phytate phosphorus; reproduction performance; tibial indexes; parathyroid hormone in plasma; broiler breeder hens

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JIANG Shouqun, JIANG Zongyong, ZHENG Chuntian, DING Fayuan, RUAN Dong . Effect of Dietary Non-Phytate Phosphorus Level on Reproduction Performance, Tibial Indexes and Plasma Biochemical Indexes of Yellow-Feathered Broiler Breeders Aged from 39 to 46 Weeks[J]. Chinese Journal of Animal Nutrition, 2015 , 27(2) : 559 -568 . DOI: 10.3969/j.issn.1006-267x.2015.02.028

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