Effects of exposure to artificial long days on milk yield, maternal insulin-like growth factor 1 levels and kid growth rate in subtropical goats
Por:
Hernández H., Flores J.A., Delgadillo J.A., Fernández I.G., Flores M.J., Mejía Á., Elizundia J.M., Bedos M., Ponce J.L., Ramírez S.
Publicada:
1 ene 2016
Resumen:
This study was designed to determine whether any relationship exists between exposure to artificial long days, milk yield, maternal plasma insulin-like growth factor 1 (IGF-1) levels, and kid growth rate in goats. One group of lactating goats was maintained under naturally decreasing day length (control group; n=19), while in another one, they were kept under artificial long days (LD group; n=19). Milk yield was higher in goats from the LD group than that in the control group (P<0.05). Maternal IGF-1 levels at day 57 of lactation were higher (P<0.05) in goats from the LD group than the levels in the control group and were positively correlated with the total milk yields per goat at days 43 and 57 of lactation (r=0.77 and r=0.84, respectively; P<0.01). Daily weight gain at week 4 was higher (P<0.01) in kids from the LD group than that in kids from the control group and was correlated with total and average IGF-1 maternal levels (r=0.60 and r=0.60, P<0.05). It was concluded that submitting lactating goats to artificial long days increases milk yield, plasma IGF-1 maternal levels and the growth rate of the kids. © 2016 Japanese Society of Animal Science.
Filiaciones:
Hernández H.:
Centro de Investigación en Reproducción Caprina (CIRCA), Universidad Autónoma Agraria Antonio Narro, Torreón, Coahuila, Mexico
Flores J.A.:
Centro de Investigación en Reproducción Caprina (CIRCA), Universidad Autónoma Agraria Antonio Narro, Torreón, Coahuila, Mexico
Delgadillo J.A.:
Centro de Investigación en Reproducción Caprina (CIRCA), Universidad Autónoma Agraria Antonio Narro, Torreón, Coahuila, Mexico
Fernández I.G.:
Centro de Investigación en Reproducción Caprina (CIRCA), Universidad Autónoma Agraria Antonio Narro, Torreón, Coahuila, Mexico
Flores M.J.:
Centro de Investigación en Reproducción Caprina (CIRCA), Universidad Autónoma Agraria Antonio Narro, Torreón, Coahuila, Mexico
Mejía Á.:
Centro de Investigación en Reproducción Caprina (CIRCA), Universidad Autónoma Agraria Antonio Narro, Torreón, Coahuila, Mexico
Elizundia J.M.:
Transportadora de Alimentos, LALA, Gómez Palacio, Durango, Mexico
Bedos M.:
Centro de Investigación en Reproducción Caprina (CIRCA), Universidad Autónoma Agraria Antonio Narro, Torreón, Coahuila, Mexico
Ponce J.L.:
Centro de Investigación en Reproducción Caprina (CIRCA), Universidad Autónoma Agraria Antonio Narro, Torreón, Coahuila, Mexico
Ramírez S.:
Centro de Investigación en Reproducción Caprina (CIRCA), Universidad Autónoma Agraria Antonio Narro, Torreón, Coahuila, Mexico
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