Levels of crude protein in multiple supplements for nelore heifers on pasture in the dry season

Semina: Ciências Agrárias

Daniel Mageste de Almeida¹  Victor Valério de Carvalho¹  Leandro Soares Martins¹  Mário Fonseca Paulino¹  Aline Gomes da Silva¹  Felipe Henrique de Moura¹  Josilaine Aparecida da Costa Lima¹  Marcos Inácio Marcondes¹  Sidnei Antônio Lopes¹  Luciana Navajas Rennó¹  Lívia Vieira de Barros² 

[1] Universidade Federal de Viçosa;Universidade Federal do Mato Grosso;

关键词: Low quality forage;    Nitrogen;    Performance;    Supplementation;   

DOI  :  10.5433/1679-0359.2015v36n3p1519

来源: DOAJ

【 摘 要 】

It was evaluated the effect of levels of crude protein supplement on performance, intake, digestibility and microbial efficiency. Forty Nelore heifers, with an initial average age of eight months and an initial average weight of 230 + 3,39 kg, were used. The evaluated supplements were: mineral mix provided ad libitum (MM), supplements containing 10%, 20%, 30% and 40% crude protein (CP), representing the treatments PB10, PB20, PB30, PB40, respectively. It was observed a higher final body weight and weight gain for supplemented animals compared to non-supplemented (P<0.10). The intake of all nutrients were higher (P <0.10) for supplemented animals compared to non-supplemented. The crude protein intake had increased linearly with increasing levels of CP in supplements. The digestibility of DM, OM, CP and TDN were higher (P<0.10) in supplemented animals compared to non-supplemented. There was a quadratic effect on CP digestibility with increased levels of CP in supplements. The production of microbial nitrogen (N mic), serum urea nitrogen (NUS) and reason urea nitrogen in the urine/creatinine nitrogen (NUU/Ncre) were higher (P<0.10) for supplemented animals. Quadratic effect was observed on production of Nmic, microbial efficiency (Emic), NUS and NUU/Ncre with increased levels of CP in multiple supplements. The multiple supplementation provides higher weight gain and final body weight in the period after weaning from Nellore females.

【 授权许可】

Unknown