Evaluation of growth of tissues and organs of crossbreed Holstein-Gyr steers during compensatory growth. 2. Tissues and organs

Revista Brasileira de Zootecnia

Almeida, Maria Izabel Vieira de²  Fontes, Carlos Augusto de Alencar³  Almeida, Fernando Queiroz de¹  Queiroz, Augusto César de²  Guimarães, Rodrigo Furtado² 

[1] Universidade Federal Rural do Rio de Janeiro, Seropédica;Universidade Federal de Viçosa, Viçosa;Universidade Estadual do Norte Fluminense, Campos

关键词: allometric equations;    cattle;    growth;    organs;    tissues   IntroduçãoA compreensão dos processos envolvidos no crescimento;    como mudanças no tamanho;    forma e composição corporal dos animais domésticos;    é fundamental a todos os aspectos da produção animal;   

DOI  :  10.1590/S1516-35982001000200033

学科分类：兽医学

来源: Universidade Federal de Vicosa

【 摘 要 】

- The research aimed to analyze the effects of feed restriction prior to the confinement on growth and chemical composition of the tissues and organs in cattle. Twenty-four Holstein-Gyr crossbred steers, with 19,3 ± 5,1 months of age and 202,1 ± 49,1 kg LW, at beginning of the trial were used. Fifteen of the animals were confined after a 104-day period of forage restriction, in which it was intended to keep body weight unchanged (compensatory gain group), while nine of them had free access to pasture (continuous gain group). At beginning of the experiment and at days 28 and 112 of confinement, three animals of each group were slaughtered, and at days 56 and 84, three animals of compensatory gain group were slaughtered. During confinement, the animals from the compensatory gain group and continuous gain group were fed ad libitum; composed b y corn silage and 26% of concentrate, as dry matter basis. The relative growth rates were evaluated through allometric equations. The rates of protein, fat and energy deposition in the carcass did not differ between treatments, in relation to empty-body weight gain (EBW). The protein deposition in the organs, in relation to EBW gain, was greater in compensatory growth group than in the continuous gain group, being the high values observed in all body parts. The growth rates of the muscles Biceps femoris and Tensor fascia latea were not affected by the feed restriction prior to the confinement, as well as the growth rate and the content of protein, calcium and phosphorus in the femur and 8th rib.

【 授权许可】

CC BY-NC