Abstract

The aim of the present study was to evaluate the effect of different dietary zinc sources (ZnSO₄, Zinc-amino acid and Zn₅(OH)₂C_l2H₂O), on hormone levels, testicular histology and sperm quality in broiler breeder roosters. Twenty, 54-week-old broiler breeder roosters (Ross 308) were reared in individual cages. Dietary treatments were T1: a basal diet without any addition of zinc (0 Zn) (Control), T2: control diet supplemented with 110 mg Zn (sulphate)/kg, T3: control diet supplemented with 110 mg Zn (organic)/kg and T4: control diet supplemented with 110 mg Zn (hydroxide)/kg. The traits measured included blood serum IGF- and testosterone, motility, concentration, viability, and membrane integrity of sperm and testicular histology. The results indicated that, significant differences between the experimental treatments in terms of serum levels of IGF and testosterone in the 32nd and 45th weeks (p < .05). The highest levels of IGF and testosterone were observed in the organic zinc treatment (T3). The results of testicular histology, fertility and sperm quality showed that there was a significant difference between experimental treatments in terms of diameter of seminiferous tubules, spermatogonia and the motility, integrity, morphology, viability and concentration of sperm (p < .05). The highest levels of these traits were observed in the organic zinc treatment (T3) and the lowest in the control treatment. In conclusion, organic zinc compared to other forms of zinc supplement can be used as an efficient feed additive for improving the fertility status of the flock of broiler breeder roosters.

• HIGHLIGHTS

• Mineral resources are used in various ways in poultry feed.

• Zinc is one of the most important mineral sources in poultry nutrition.

• Organic zinc has been shown to perform better than other sources of zinc.

摘要

本研究的目的是评估不同饮食锌源（ZnSO ₄，氨基酸锌和Zn ₅（OH）₂ C _l2 H _{2的影响）。}O），关于肉鸡种公鸡的激素水平，睾丸组织学和精子质量。在单独的笼子里饲养了二十只，54周龄的肉鸡种鸡（罗斯308）。饮食治疗为T1：不添加锌（0 Zn）的基础饮食（对照），T2：补充110 mg锌（硫酸盐）/ kg的对照饮食，T3：补充110 mg锌（有机）/ kg的对照饮食和T4：对照饮食，每公斤补充110毫克的锌（氢氧化物）。所测量的特征包括血清IGF-和睾丸激素，活力，浓度，生存力以及精子的膜完整性和睾丸组织学。结果表明，在第32周和第45周，实验治疗之间的血清IGF和睾丸激素水平存在显着差异（p <.05）。在有机锌处理（T3）中观察到了最高水平的IGF和睾丸激素。睾丸组织学，生育力和精子质量的结果表明，实验治疗之间在生精小管的直径，精子和活动性，完整性，形态，生存力和精子浓度方面存在显着差异（p  <.05）。在有机锌处理（T3）中观察到这些性状的最高水平，而在对照处理中观察到的最低。总之，与其他形式的锌补充剂相比，有机锌可以用作改善肉鸡种鸡群育性状况的有效饲料添加剂。

• 强调

• 矿产资源以多种方式用于家禽饲料中。

• 锌是家禽营养中最重要的矿物质之一。

• 已经证明有机锌比其他锌源的性能更好。