Componentes do corpo vazio de vacas da raça Purunã abatidas com pesos distintos

Abstract

ResumoObjetivou-se avaliar os componentes do corpo vazio de vacas de descarte com pesos distintos. Utilizaramse 43 vacas da raça Purunã com idade média de 68,02 ± 17,36 meses. O delineamento experimental utilizado foi o inteiramente casualizado. Os pesos de abate estudados foram de 401, 434, 461, 476 e 522 kg. O peso e o rendimento de corpo vazio responderam linearmente à elevação do peso de abate, aumentando 65,16 g e 0,0253% a cada quilograma acrescido, respectivamente. O aumento do peso de abate proporcionou aumento linear da quantidade absoluta dos componentes não carcaça. O peso do trato gastrointestinal aumentou 9,61 g a cada quilograma acrescido no peso de abate, não sendo alterado pela variável independente quando expresso em percentagem do corpo vazio. O peso absoluto e peso relativo do conjunto de órgãos internos variou de forma linear positiva e negativa, respectivamente, com o avanço do peso de abate. O aumento do peso de abate proporcionou aumento linear do conjunto de gorduras internas. O conjunto de componentes externos aumentou 8,6 g a cada quilograma acrescido no peso de abate. A elevação do peso de abate, acima das exigências mínimas dos frigoríficos, prejudica a eficiência do sistema produtivo, em virtude do aumento proporcional dos componentes não carcaça. Palavras-chave: Abomaso, couro, fígado, rúmen, trato gastrointestinal AbstractThe objective was to evaluate the empty body components of cull cows slaughtered at different weights. It was used 43 Purunã cull cows mean age of 68.02 ± 17.36 months. The experimental design used was the completely randomized. The slaughter weights studied were 401, 434, 461, 476 and 522 kg. Empty body weight and yield increased 65.16 g and 0.0253% for each kg increased in body weight, respectively. The increase slaughter weight promoted linear increase of the absolute amount of noncarcass components. The weight of the gastrointestinal tract increased to 9.61 g per kilogram over the weight of slaughter, not being changed by the independent variable when expressed as percentage of empty body. The absolute and relative weight of internal organs varied linearly positive and negative 1 Pós-Doutorando (s), Fundação Universidade Federal do Tocantins, Araguaína, TO.

Carcass characteristics of feedlot-finished Nellore heifers slaughtered at different weights

“…In this way, no difference was expected for this trait, since the animals spend the same time confined. Missio et al (2013b) examined carcass characteristics of cull cows slaughtered at different weights and obtained different results, reporting that an increase in slaughter weight from 401 to 522 kg prompted a linear increase in back fat thickness, which rose from 1.11 to 4.79 mm. Similarly, Kuss et al (2005) studied carcass characteristics of cull cows of different genetic groups finished at different weights and found that those slaughtered at 566 kg LW produced a thinner back fat than those slaughtered at 465 kg (7.5 vs. 4.4 mm).…”

“…The carcass weight can be elevated by increasing the animal weight at slaughter, since these two characteristics are positively correlated (Missio et al, 2013b). However, as stated by Missio et al (2013a), increasing the slaughter weight to values greater than the minimum required by slaughterhouses undermines the efficiency of the production system due to the proportional increase in non-carcass components, which culminates in decreased biological efficiency of transformation of consumed feed into weight gain.…”

Characteristics of the non-carcass components of steers fed different sources of dietary carbohydrates

“…The steers fed on WB presented higher absolute and relative omasum weights than those fed on GC or SH, with these latter two diets presenting similar omasum results (Table 3). Missio et al (2013), when studying Purunã cattle slaughtered at different weights, observed that the absolute weight of the omasum increased linearly with increase of the SW. Similarly, Jones et al (1985) found higher omasum weights for animals fed diets based on forage (50% corn silage + 50% alfalfa hay) than for animals fed diets based on concentrate (30% corn silage + 70% GC).…”

Níveis de concentrado e farelo do mesocarpo de babaçu sobre as características da carcaça de tourinhos confinados

“…Dentre os fatores que afetam o rendimento de carcaça, o conteúdo gastrointestinal tem sido considerado o principal fator PACHECO et al, 2006b;PASCOAL et al, 2011), o qual contribui para redução do rendimento de carcaça, devido estimular a distensão e aumento de tamanho do retículo-rúmen MENEZES et al, 2011;MISSIO et al, 2013). O FMB, nesse sentido, apesar de ter apresentado superior teor de fibra em detergente neutro em relação ao grão de milho (31,6% vs 9,5%), apresenta 96% das partículas com tamanho inferior a 1,18 mm , o que não reflete efeito direto sobre o enchimento ruminal.…”