Organs and carcass non-integrant components of Holstein calves, slaughtered at different weights, held in different finishing systems

Abstract

The objective of this study was to evaluate the weight of the empty body and non-integrant components of Holstein calves carcass, kept in confinement system or pasture, slaughtered at different weights. We used 43 Holstein calves, entire, age and initial body weight of approximately 58 days and 57 kg, distributed entirely at random in confinement or cultivated pasture. In feeding systems, it was prestipulated four slaughter weights (SW -140, 180, 220 and 260 kg of live weight). In confinement, were provided corn silage and concentrate based on corn meal and soybean meal, in the ratio 40:60. The other animals in ryegrass pasture, followed by pearl millet, were fed based in supplementation of corn bran and soybean meal to 1% of live weight. The EBW showed linear growth with increasing slaughter weight (SW), as well as income from hot and cold carcass and there was no effect in relation EBW/ SW. The leather, the scraps, the head, the legs, as well as the sum of external components showed growth in its absolute weight as the weight increased at the slaughter of animals. In relative terms, the hot and cold carcass yields were inversely correlated with the relative weights, as well as external components (-0.68 and -0.81), the heart (-0.35 and -0, 38) lungs (-0.53 and -0.53), the sum of the gastrointestinal tract (-0.75 and -0.77), the sum of vital organs (-0.71 to -0.75) respectively in feedlot and pasture. This is due to the different ages that the animals were slaughtered (200; 237; 251 and 263 days of age), due to prestipulate weights. The absolute weights of heart, kidney, lungs, liver, spleen, gall bladder, reproductive tract and gastrointestinal tract accompanied the increase in weight at animal's slaughter. However, when grouped, showed no difference related to the increase in weight at slaughter. The differences presented by the liver, trachea and spleen were sufficient to alter the absolute and relative weights of the set of internal components, where the animals finished on pasture had higher weight. The animals finished on pasture had higher absolute weights (0.48 against 1.18 kg) and relatives (0.31 and 0.79%). ResumoO objetivo do trabalho foi avaliar o peso do corpo vazio (PCVZ) e os componentes não-carcaça de 43 bezerros holandeses, não castrados, com idade de 58 dias e peso médio de 60 kg, distribuídos ao acaso em confinamento ou pastagem cultivada. Em cada sistema, foram pré-estipulados quatro pesos de abate 180, 220 e 260 kg de peso vivo). No confinamento, foram fornecidos silagem de milho e concentrado à base de farelo de milho e farelo de soja, na relação 40:60. Os demais animais em pastagem cultivada de azevém e milheto, com suplementação a 1% do peso vivo. O PCVZ apresentou crescimento linear com o aumento do peso de abate, assim como os rendimentos de carcaça quente e fria e não houve efeito na relação PCVZ/PAB. O crescimento absoluto dos componentes externos foi proporcional ao aumento de peso. Em peso relativo ao PCVZ apenas a cabeça e as patas apresentaram diminuição em resposta ao ...

Crude glycerin in corn grain-based diets for dairy calves

“…The weight of internal organs, according to Dias et al (2016), follows body weight in dairy calves, which may explain much of the results for internal organ characteristics. In addition, according Perón et al (1993), heart and lungs maintain their integrity because they have a priority in nutrient use, regardless of the intake level.…”

“…The decrease in the weight of the small intestine, however, can be explained by DMI reduction, which could have reduced metabolic activity in this organ, altering its size (Missio et al, 2009b). In general, it has been verified that the weight of the large intestine, on the other hand, is not altered by the supply of different diets and/or feeding systems (Dias et al, 2016), which possibly is associated with less metabolic activity in relation to small intestine, which has the absorption of water as one of the main functions (Gasaway et al, 1976).…”