Effect of Different Sources and Concentrations of Zinc in the Mineral Mixture on Performance and Seminal Characteristics of Grazing Young Bulls / Efeito de Diferentes Fontes e Concentrações de Zinco na Mistura Mineral Sobre Desempenho e Características Seminais de Touros Jovens Criados em Campo

AUTOR(ES)
DATA DE PUBLICAÇÃO

2006

RESUMO

Sixteen young Nellore bulls of approximately 26 months were distributed in four paddocks of Brachiaria brizantha cv. Marandu and submitted to four different supplementations of zinc in the mineral mixture: Zn-0 (without zinc); Zn 30FO (30 mg of organic Zn/Kg); Zn 30FI (30 mg of inorganic Zn/Kg) and Zn 60FI (60 mg of inorganic Zn/Kg). The inorganic source (FI) of zinc was zinc sulfate and the organic (FO), zinc-lysine-methionine. Mineral mixture intake was weekly measured and it was verified that the animals of Zn-0 had higher mineral mineral intake than the animals of other treatments, differing statistically (P <0,05) of Zn-30FO, Zn-30FI and Zn-60FI. Every fifteen days the animals were weighted, blood and semen were collected and complete andrological analyses were done in the semen. No statistical differences were observed (P>0,05) among treatments for weight gain. Bulls of Zn-0 showed spermatozoids with less motility and vigor and higher chances of having spermatozoids with head, middle piece and proximal citoplasmatic drop defects. Animals supplemented with 60 mg ZnSO4/Kg in the mineral mixture showed higher chances of not having head, intermediate piece and proximal citoplasmatic drop defects in their spermatozoids, compared to the other treatments. Different sources and concentrations of zinc in the mineral mixture of young bulls didn t affect the performance on experimental conditions, but did in the seminal characteristics.

ASSUNTO(S)

espermatozóides producao animal growth zinc-lysine-methionine crescimento touro spermatozoids zinc sulfate sulfato de zinco zinco-lisina-metionina

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