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1.
Trop Anim Health Prod ; 55(1): 27, 2022 Dec 26.
Artigo em Inglês | MEDLINE | ID: mdl-36567414

RESUMO

The aim of this study was to evaluate the effect of heat stress on the suckling behavior and performance of Nelore (NE), ½ Nelore × ½ Angus (NA), and ½ Nelore × ½ Pantaneiro (NP) crossbred calves, in environments shaded or unshaded, using the temperature-humidity index (THI) and Kleiber index (KI) equations. Twenty-five animals were evaluated, from 30 days of age distributed as follows: 9 NE, 8 NA, and 8 NP calves, from 7:00 A.M. to 5:00 P.M., under shaded and unshaded environments. Data were collected on number of suckling episodes per day (NS), mean suckling duration (MSD), surface body temperature (SBT), THI, weight gain, and KI. THI showed difference (P < 0.05) between environments, being lower in the shaded area. NA cattle had higher SBT (33.00 ± 2.31), differing (P < 0.05) from NE (31.71 ± 1.65) and NP (31.38 ± 1.99), and lower (P < 0.05) suckling activity, suggesting reduced thermal comfort. However, their weight gain and KI were higher, differing (P < 0.05) from the other genetic groups. NE and NP cattle did not differ (P > 0.05) in weight gain and KI. Thus, the results suggest that NA calves, despite the greater thermal discomfort, used thermolysis mechanisms to maintain higher weight gain and feed efficiency (KI) than the other groups. NP showed greater thermal adaptability, in addition to weight gain and KI similar to NE cattle.


Assuntos
Temperatura Corporal , Resposta ao Choque Térmico , Bovinos , Animais , Temperatura , Umidade , Aumento de Peso
2.
Ciênc. rural (Online) ; 50(5): e20190819, 2020. tab
Artigo em Inglês | LILACS-Express | LILACS | ID: biblio-1098177

RESUMO

ABSTRACT: This study sought to evaluate the number of bruises on bovine carcasses and their relationship with loading rates in different truck models. Bruising percentages in the hindquarter, forequarter and short rib regions were evaluated. The space occupied on the truck by each animal in m² was defined as the Practiced area, obtained by dividing the body area by the number of males and females transported in straight trucks (10.60 x 2.40 m) and livestock trailers (14.80 x 2.60 m), 240 and 168, and 120 and 93, respectively, and 80 males in a straight truck with trailer configuration (17.50 x 2.60 m). The minimum area occupied by the animals was assessed according to the Farm Animal Welfare Council (FAWC) and Animal Welfare Advisory Committee (AWAC). The data was analyzed in a completely randomized design and included two sex classes, three carcass regions and three truck types. For males, the minimum areas (m²) calculated by the FAWC and AWAC were smaller (1.37 and 1.29 m², respectively) for the straight truck. The straight truck with trailer configuration had the lowest (P=0.0025) bruising index in the forequarter region (15.1%) and the highest (P=0.047) in the short rib region (30.5%). Females transported in the livestock trailer had a higher (P<0.001) percentage of bruises in the forequarter region (51.7%). There was a relationship between the high bruising rates and the loading rate Practiced for the males. Estimations made by the AWAC are close to those practiced in the upper Pantanal region of Mato Grosso do Sul, Brazil.


RESUMO: Este estudo teve por objetivo avaliar o número de hematomas em carcaças de bovinos e suas relações com as taxas de lotação em diferentes modelos de carrocerias. Foi avaliada a porcentagem de hematomas na região do traseiro, dianteiro e ponta da agulha (PA). O espaço ocupado por cada animal em m² foi definido como área Praticada, sendo obtido pela divisão da área da carroceria pelo número de machos e fêmeas transportados nos caminhões truck (10,60 x 2,40 m) e carreta baixa (14,80 x 2,60 m); 240 e 168; 120 e 93, respectivamente, e 80 machos em caminhão romeu e julieta (17,50 x 2,60 m). Avaliou-se a área mínima ocupada por animal pela Farm Animal Welfare Council (FAWC) e Animal Welfare Advisory Committee (AWAC). Os dados foram analisados em um delineamento inteiramente casualizado sendo duas classes sexuais, três regiões da carcaça e três tipos de caminhões. Para machos, as áreas mínimas (m²) pela FAWC e AWAC foram menores (1,37 e 1,29 m², respectivamente) para o caminhão truck. O caminhão romeu e julieta apresentou o menor (P=0,0025) índice de hematomas na região dianteiro (15,1%) e o maior (P=0,047) na PA (30,5%). As fêmeas transportadas no caminhão carreta baixa, apresentaram maior (P<0,001) porcentagem de hematomas na região dianteiro (51,7%). Houve relação entre os altos índices de hematomas e a taxa de lotação Praticada para o caminhão carreta baixa e romeu e julieta para machos. As determinações realizadas pela AWAC estão próximas das Praticadas no Alto Pantanal sul-mato-grossense.

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