Crude glycerin in diets for feedlot Nellore cattle

Revista Brasileira de Zootecnia

Eric Haydt Castello Branco Van Cleef¹  Jane Maria Bertocco Ezequiel¹  André Pastori D'aurea¹  Vanessa Ruiz Fávaro¹  Juliana Borsari Dourado Sancanari¹ 

[1] ,Universidade Estadual Paulista Júlio de Mesquita Filho Departamento de Zootecnia Jaboticabal SP ,Brasil

关键词: beef cattle;    by-products;    carcass;    digestion;    glycerol;   

DOI  :  10.1590/S1516-35982014000200006

来源: SciELO

【 摘 要 】

Two studies were conducted to evaluate the effects of crude glycerin on feed intake, performance, carcass characteristics, and total digestibility of Nellore bulls. In experiment 1, cattle (n = 30) were fed a control diet without crude glycerin and diets containing 7.5, 15, 22.5, and 30% crude glycerin, for 103 d. Animals were harvested and data of carcass characteristics were collected. In experiment 2, a digestibility trial was performed using indigestible acid detergent fiber (iADF) as internal marker, and five rumen-cannulated steers. Both experiments were conducted as a randomized complete block design and data were analyzed using mixed procedures. In experiment 1 no differences were observed among treatments on dry matter intake, and performance variables. Regarding carcass characteristics, no effect was observed, except for carcass fat estimates, which were greater in treatments with crude glycerin. In experiment 2, crude glycerin promoted a decrease in digestibility of fibrous fractions NDF and HEM, and increased digestibility of crude protein by 6%. Although it caused negative effect on digestibility of fibrous fraction of diets, crude glycerin can be a good energy source for Nellore bulls, since no losses are observed on performance and carcass characteristics when animals are fed up to 30% of this by-product.

【 授权许可】

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