Molecular Nutrition

Effects of Dietary Calcium and Phosphorus Deficiency on Growth Performance, Rickets Incidence Characters and Tibia Histological Structure of Broilers during 1 to 21 Days of Age

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  • 1. Mineral Nutrition Research Division, Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing 100193, China;
    2. Department of Animal Science, Hebei Normal University of Science and Technology, Qinhuangdao 066004, China

Received date: 2018-10-24

  Online published: 2019-05-15

Abstract

This experiment was conducted to investigate the effects of dietary calcium (Ca) or phosphorus (P) deficiency on growth performance, rickets incidence characters and tibia histological structure of broilers during 1 to 21 days of age. A total of 504 one-day-old Arbor Acres male broilers were selected, and a 2×2 two-factor complete random test design was adopted, there were two Ca levels (1.00% and 0.35%) and two non-phytate phosphorus (NPP) levels (0.45% and 0.23%), the 4 groups were normal control group (1.00% Ca+0.45% NPP), P deficiency group (1.00% Ca+0.23% NPP), Ca deficiency group (0.35% Ca+0.45% NPP) and Ca and P deficiency group (0.35% Ca+0.23% NPP), respectively; and there were 7 replicates per groups and 18 broilers per replicate. The experiment lasted for 21 days. The results showed that the interaction between Ca and P levels was significantly affected the average daily feed intake, average daily gain and feed to gain ratio at all stage of broilers during 1 to 21 days of age, tibia length at 7, 14 and 21 days of age, the lengths of proliferating zone and hypertrophy zone in tibia growth plate at 7 days of age, and the length of hypertrophy zone in tibia growth plate at 14 days of age (P<0.05). In the normal Ca level, low P significantly decreased the average daily feed intake and average daily gain at all stage of broilers during 1 to 21 days of age (P<0.05), significantly increased the feed to gain ratio (P<0.05), and significantly improved the length of hypertrophy zone in tibia growth plate at 7 and 14 days of age (P<0.05); in the low Ca level, low P significantly improved the average daily gain during 15 to 21 days of age and 1 to 21 days of age and the length of hypertrophy zone in tibia growth plate at 7 days of age (P<0.05), and significantly decreased the length of proliferating zone in tibia growth plate at 7 days of age (P<0.05). Besides, compared with the P deficiency group, the average daily feed intake and average daily gain at all stage of broilers during 1 to 21 days of age and the length of proliferating zone in tibia growth plate at 7 days of age of Ca deficiency group and Ca and P deficiency group were significantly increased (P<0.05), and the length of hypertrophy zone in tibia growth plate at 7 and 14 days of age was significantly decreased (P<0.05). The results indicate that the growth performance and tibia structure are the most sensitive to the P deficiency, followed by the Ca deficiency, and then the Ca and P deficiency has weaker influence. The typical characteristics of rickets show that the length of hypertrophy zone in tibia growth plate is lengthened in the P deficiency group, while the length of proliferating zone in tibia growth plate is lengthened in the Ca deficiency group and Ca and P deficiency group, but Ca and P deficiency group has the shorter length of proliferating zone in tibia growth plate than Ca deficiency group in the early stage.

Cite this article

SHAO Yuxin, XING Guanzhong, ZHANG Liyang, LYU Lin, LI Sufen, LIAO Xiudong, LUO Xugang . Effects of Dietary Calcium and Phosphorus Deficiency on Growth Performance, Rickets Incidence Characters and Tibia Histological Structure of Broilers during 1 to 21 Days of Age[J]. Chinese Journal of Animal Nutrition, 2019 , 31(5) : 2107 -2118 . DOI: 10.3969/j.issn.1006-267x.2019.05.017

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