INFLUÊNCIA DO TEMPO DE PERMANÊNCIA DOS OVOS DE AVESTRUZES NO NINHO SOBRE A TAXA DE ECLOSÃO

O objetivo do experimento foi avaliar se o tempo de permanência dos ovos no ninho afeta a qualidade do ovo a ser incubado interferindo na taxa de eclosão. Utilizaram-se 34 ovos divididos em blocos inteiramente casualizados. A coleta dos ovos foi realizada em dois períodos, manhã (tratamento 1) e madrugada (tratamento 2). Os parâmetros de qualidade dos ovos foram avaliados por meio do peso dos ovos nos dias 0 e 39 de incubação (g), índice de perda de peso do ovo (%), taxa de fertilidade (%), eclodibilidade (%) e mortalidade (%). Os resultados obtidos mostram que não houve diferença significativa em nenhuma das variáveis analisadas. Dessa forma, pode-se concluir que o tempo de permanência no ninho não influência na taxa de eclosão dos ovos, uma vez que o baixo índice de eclodibilidade possa estar relacionado a problemas durante o manejo de incubação, genéticos ou nutricionais

Effects of different energy source diets, as corn substitutes, on carcass characteristics and meat quality of feedlot lambs

This study evaluated the effects of different energy sources, as corn substitutes, on the carcass characteristics and meat quality of lambs. Twenty-four intact ram lambs were identified, weighed, and assigned to one of four dietary treatments: corn, citrus pulp, rice bran, and soybean hulls. The ram lambs were confined in feedlots, and when they reached 30 kg of live weight, they were slaughtered. A  completelyrandomized design with different replicates was used for the analysis, along with the Tukey-5% test. For hot and cold carcass weight, rice bran produced lower values than the other dietary treatments. For the red color content of the meat, citrus pulp presented superior values when compared to corn, whereas meat and fat color, loin eye area, and objective tenderness did not differ between treatments. Different energetic sources used to replace corn in ram lambs finishing diets did not affect the proximate composition and quality of the meat. Highlights:  • Addition of rice bran to the lambs' diet resulted in lower hot and cold carcass weight.• Animals fed soybean hulls presented the highest carcass compactness index values.• Rice bran extended the feedlot period of lambs in 59.33 days, been longer than the others energies sources.• Corn, rice bran, citrus pulp and soybean hulls did not change the quality of meat but the inclusion of rice bran should be carefully evaluated.This study evaluated the effects of different energy sources, as corn substitutes, on the carcass characteristics and meat quality of lambs. Twenty-four intact ram lambs were identified, weighed, and assigned to one of four dietary treatments: corn, citrus pulp, rice bran, and soybean hulls. The ram lambs were confined in feedlots, and when they reached 30 kg of live weight, they were slaughtered. A  completelyrandomized design with different replicates was used for the analysis, along with the Tukey-5% test. For hot and cold carcass weight, rice bran produced lower values than the other dietary treatments. For the red color content of the meat, citrus pulp presented superior values when compared to corn, whereas meat and fat color, loin eye area, and objective tenderness did not differ between treatments. Different energetic sources used to replace corn in ram lambs finishing diets did not affect the proximate composition and quality of the meat. Highlights:  • Addition of rice bran to the lambs' diet resulted in lower hot and cold carcass weight.• Animals fed soybean hulls presented the highest carcass compactness index values.• Rice bran extended the feedlot period of lambs in 59.33 days, been longer than the others energies sources.• Corn, rice bran, citrus pulp and soybean hulls did not change the quality of meat but the inclusion of rice bran should be carefully evaluated