ACTA VETERINARIA ET ZOOTECHNICA SINICA ›› 2015, Vol. 46 ›› Issue (10): 1791-1805.doi: 10.11843/j.issn.0366-6964.2015.10.012

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Effect of Dietary Zinc on Laying Performance,Hatching Performance of Eggs and Plasma Antioxidant Capacity of Broiler Breeder Hens under Different Temperatures

LI Wen-xiang,LÜ Lin,ZHU Yong-wen,ZHANG Li-yang,LUO Xu-gang*   

  1. (Mineral Nutrition Research Division,Institute of Animal Science,Chinese Academy of Agricultural Sciences,Beijing 100193,China)
  • Received:2014-12-26 Online:2015-10-23 Published:2015-10-23

Abstract:

This experiment was conducted to investigate the effect of dietary zinc(Zn) on laying performance,egg quality,hatching performance of eggs and plasma antioxidant capacity of broiler breeder hens under different temperatures,and discussed the anti-heat stress effect of dietary Zn on broiler breeder hens preliminarily.One hundred and forty-four twenty-three-week-old female broiler breeders were randomly allotted to 6 treatments with 6 replicates of 4 birds per replicate based on body weight(BW).A completely randomized factorial design involved in 2 environmental temperatures:(21±1) ℃ normal temperature and(32±1) ℃ high temperature and 3 dietary Zn treatments:a no Zn addition corn-corn starch-soy isolate protein meal basal diet(9.98 mg•kg-1 Zn),and the basal diet supplemented with 110 mg•kg-1 Zn of diet as either ZnSO4•7H2O or Zn proteinate with the moderate chelation strength(Qf=30.73).The adaptation period was 7 weeks,the Zn depletion period was 3 weeks and the experimental period was 3 weeks.The result showed as follows:1) Feed intake had not significant difference(P>0.10) between normal and high temperature.On that condition,heat stress significantly decreased laying rate,average egg weight,eggshell thickness,egg yolk color,eggshell weight(P<0.01),eggshell strength(P<0.10),and plasma CuZn superoxide dismutase(CuZnSOD) activities(P<0.01) of broiler breeder hens,and significantly increased the broken egg rate,feed-egg ratio(P<0.01),and plasma malondialdehyde(MDA) content(P<0.10).2) Compared with the no Zn addition group,broiler breeder hens fed the diets added Zn regardless of sources(P>0.10) had higher birth rate and healthy young chicken percentage(P<0.05).Broiler breeder hens fed the diet added organic Zn had higher yolk color score,plasma Zn,and plasma CuZnSOD activities(P<0.10) than those fed the diets added inorganic Zn and no Zn addition group,which had not significant difference(P>0.10).3) No interactions(P>0.10) between temperature and dietary Zn were observed in all of above indices.The results indicate that the high temperature impaired laying performance,eggshell quality,and yolk color score,and plasma antioxidant capacity of broiler breeder hens.Diet added either organic or inorganic Zn improves hatching performance of eggs of broiler breeder hens,and especially the effect of the organic Zn on increasing the yolk color score,plasma Zn,and plasma CuZnSOD activities is better than that of the inorganic Zn.

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