Abstract:O experimento foi conduzido na Universidade Federal de Lavras. Foram utilizados 64 cordeiros. Após o nascimento, os animais foram distribuídos em quatro tratamentos: Dieta A -8,67; Dieta B -17,34; Dieta C -26,01 e Dieta D -34,68% de FDN proveniente da forragem (FDNf) na dieta. Aos três dias de idade, os cordeiros foram separados de suas mães e passaram a receber substituto do leite de ovelha até o desaleitamento aos 55 dias. As dietas experimentais utilizadas foram isonitrogenadas, balanceadas para atender às … Show more
“…This effect was probably more pronounced in diets with higher palm content, due to the greater amount of mucilage. In this way, the greater quantity and lower quality of fiber from bagasse consumed in the diets with more palm may have contributed to the linear reduction in the digestibility of NDF and consequently in the digestibility of DM, given that the quality of fiber can increase or reduce the degradation of fibrolytic bacteria in the rumen (Macedo Júnior et al, 2007).…”
The aim of this study was to evaluate the consumption and digestibility of nutrients, production and composition of milk, and water intake of lactating dairy cows fed standard diets in which corn (M) was replaced by forage palm (PF). Eight Girolando cows (½ Holstein/Zebu blood), 3rd calf multiparous, with 60 to 80 days of lactation and an average weight of 450.0 ± 30.0 kg, were randomly distributed in a double Latin square (4x4). Four experimental diets were evaluated: (100% M + 0% PF), (66.6% M + 33.3% PF), (33.3% M + 66.6% PF) and (0% M + 100% PF). There was a difference (P<0.05) in the consumption of CP and EE (kg.day1), with a quadratic effect and a linear reduction, respectively, with substitution. The maximum CP consumption of 3.05 kg.day-1 was found at 46.07% and EE consumption fell by 3.81g for each percentage unit of palm added to the diet. There was a quadratic difference (P<0.05) for DM consumption in %PC and g.kg PC0,75, with maximum values of 3.97%PC and 186.8 g.kg PC0,75 with the substitution of 54.83 and 53.17%, respectively. There was a quadratic effect (P<0.05) for the consumption of NDF in %PC, with the maximum intake of 1.3% at the 74.69% substitution level. There was a linear reduction (P<0.05) in the digestibility of DM, NDF and NDT, and for the other nutrients there was no substitution effect (P>0.05). There was no difference (P>0.05) in milk production and composition. There was a linear reduction (P<0.05) in water intake. Forage palm can be used in a promising way to replace corn up to a level of 100% in the diet of lactating dairy cows.
“…This effect was probably more pronounced in diets with higher palm content, due to the greater amount of mucilage. In this way, the greater quantity and lower quality of fiber from bagasse consumed in the diets with more palm may have contributed to the linear reduction in the digestibility of NDF and consequently in the digestibility of DM, given that the quality of fiber can increase or reduce the degradation of fibrolytic bacteria in the rumen (Macedo Júnior et al, 2007).…”
The aim of this study was to evaluate the consumption and digestibility of nutrients, production and composition of milk, and water intake of lactating dairy cows fed standard diets in which corn (M) was replaced by forage palm (PF). Eight Girolando cows (½ Holstein/Zebu blood), 3rd calf multiparous, with 60 to 80 days of lactation and an average weight of 450.0 ± 30.0 kg, were randomly distributed in a double Latin square (4x4). Four experimental diets were evaluated: (100% M + 0% PF), (66.6% M + 33.3% PF), (33.3% M + 66.6% PF) and (0% M + 100% PF). There was a difference (P<0.05) in the consumption of CP and EE (kg.day1), with a quadratic effect and a linear reduction, respectively, with substitution. The maximum CP consumption of 3.05 kg.day-1 was found at 46.07% and EE consumption fell by 3.81g for each percentage unit of palm added to the diet. There was a quadratic difference (P<0.05) for DM consumption in %PC and g.kg PC0,75, with maximum values of 3.97%PC and 186.8 g.kg PC0,75 with the substitution of 54.83 and 53.17%, respectively. There was a quadratic effect (P<0.05) for the consumption of NDF in %PC, with the maximum intake of 1.3% at the 74.69% substitution level. There was a linear reduction (P<0.05) in the digestibility of DM, NDF and NDT, and for the other nutrients there was no substitution effect (P>0.05). There was no difference (P>0.05) in milk production and composition. There was a linear reduction (P<0.05) in water intake. Forage palm can be used in a promising way to replace corn up to a level of 100% in the diet of lactating dairy cows.
“…Algunas investigaciones (De Lima et al, 2014) mejores incrementos de peso y medidas altas de la CE, siendo ésta última altamente dependiente de la cantidad de EM consumida. En el trabajo de Ramírez et al (2020) se demostró un positivo desarrollo testicular y una mejora en las características seminales de los machos tratados.…”
Resumen
Para seleccionar los carneros que entran a formar parte del rebaño, en el grupo de los reproductores, la evaluación de la aptitud reproductiva ha resultado ser una excelente herramienta; esta evaluación consta de un examen físico general, una prueba andrológico y un espermograma. Dentro de la prueba andrológico, la medida de la circunferencia escrotal ha tenido importancia, debido a que hace referencia al tamaño testicular definido en centímetros, la cual está relacionada con la capacidad del testículo para producir espermatozoides y por ende con la fertilidad del macho reproductor. Su uso se ha extendido por ser de fácil y confiable medición; presenta correlaciones significativas con medidas morfométricas especialmente con el peso corporal y es una característica heredable a las futuras generaciones; esta correlación positiva también se ha determinado con el espermograma, debido a que tanto el volumen seminal, concentración y calidad espermática tienen una relación directa con la medida de la circunferencia escrotal. Finalmente, cuando el carnero ha sido valorado y se encuentra apto para servir, es el mismo carnero que demuestra el resultado con su capacidad de servicio, expresada en habilidad para la monta y la libido o deseo sexual. La evaluación de la aptitud reproductiva constituye parámetros para una eficiente selección, en la que se debe tener en cuenta también factores inherentes al animal como son factores nutricionales, aspectos medioambientales, la raza y factores endocrinos, que de una u otra forma pueden afectar la conducta sexual del carnero. El objetivo del presente trabajo fue realizar una revisión de literatura que permita identificar la utilidad de la prueba andrológico en el carnero, haciendo énfasis en la medida de la circunferencia escrotal como indicador de la calidad espermática y de la eficiencia reproductiva para la selección de sementales.
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