Efecto del amamantamiento restringido sobre características de crecimiento en ovinos de pelo colombiano

Abstract

Objetivo. Evaluar el efecto del amamantamiento restringido (AR) sobre parámetros de crecimiento (peso ajustado (PA) y ganancia de peso diaria (GPD), condición corporal (CC) y puntaje de FAMACHA® (FA) durante la lactancia y pos-destete en ovejas de pelo colombiano (OPC). Materiales y métodos. 76 OPC con crías, fueron asignados a uno de dos tratamientos. Tratamiento 1 (T1), corderos con amamantamiento continuo (AC): 24 horas con la madre (n= 38). Tratamiento 2 (T2), amamantamiento restringido (AR), 10 horas (n=38). Se realizaron mediciones cada 30 días desde el nacimiento hasta los 210 días con destete a los 90 días. Fue evaluado el PA, la GPD, la CC y el FA, analizándose los datos con un modelo lineal de efectos fijos y medidas repetidas y prueba de Tukey–Kramer. Resultados. Los PA antes de los 60 días no variaron significativamente entre T1 y T2. Luego del destete y hasta el final del experimento, los PA fueron significativamente (p<0.001) mayores en T2. Las GPD promedio pre-destete no variaron entre T1 y T2 (p=0.053). La GPD pos-destete varió significativamente (p<0.001) entre T1 y T2 (82.38±17.4 y 123.95±20.6 gr/día respectivamente). Luego del destete la CC fue más alta (p<0.001) en los corderos en T2. No se encontraron diferencias en FA durante la lactancia. Luego del destete, T2 presentó mejor calificación (p<0.001). Conclusiones. T1 y T2, presentaron el mismo desempeño al destete. Sin embargo, las diferencias desde el destete hasta los siete meses de edad fueron a favor de los corderos sometidos a T2.

Association of the MC4R gene with growth traits and meat quality in Colombian hair sheep

“…The weaning weight presented here is higher than that reported in other studies: 11.6 ± 3.6 kg [ 3 ], 11.2 ± 3.7 kg [ 4 ], and 10.3 ±1.7 kg [ 5 ]. But less than the weight found by Palacios et al [ 2 ] (15.1 ± 3.9) and Lenis et al [ 12 ] (18.5 ± 0.7).…”

“…Several studies have reported the behavior of growth variables in OPC lambs. The BW was lower than that presented by Montes-Vergara et al [ 3 ] (2.8 ± 0.21 kg), Vergara et al [ 4 ] (2.6 ± 0.6 kg), Palacios et al [ 2 ] (2.8 ± 0.8 kg), Noriega et al [ 5 ] (3.2 ± 0.5 kg), and Lenis et al [ 12 ] (3.10 ± 0.70 kg). These differences are associated with the number of lambs at birth [ 34 ], ewe age [ 35 , 36 ], the feeding management of the pregnant ewes during the last third of gestation [ 37 ], and the male used during the breeding season [ 3 ].…”

“…On the other hand, the postWDG found here is higher than other works already cited in the OPC [ 4 , 2 , 12 ]. The postWDG was positively and significantly correlated with the weights measured after weaning (Table 5), which were lower than those presented in other studies for the weights at [ 5 ] and ASW [ 2 ], which could be due to the effect on animal management practices related to feeding and health-care management during lamb fattening [ 7 ].…”

“…The preWDG value is higher than that reported for this breed by Montes-Vergara et al [ 3 ] (95 ± 40 gm) and Vergara et al [ 4 ] (95 ± 40 gm), but lower than that reported by Palacios et al [ 2 ] (137.3 ± 43.3 gm) and Lenis et al [ 12 ] (128.3 ± 28.3 gm). Certainly, the ewe’s colostrum and milk production capacity [ 36 ], the feed supply to the ewe and their lamb [ 2 , 4 ], the number of lactating lambs [ 36 ], the body condition [ 5 ], and the health status of the ewe and its lamb [ 5 ] may be associated with these variations. Likewise, preWDG, as expected, was positively and significantly correlated with postweaning weights.…”

“…Based on the above, to standardize the production process, efforts have been made to slaughter animals weighing more than 30 kg and under 1 year of age. In this sense, various investigations have characterized the growth of OPC in various production conditions [ 2 – 5 ]. However, studies on carcass quality [ 6 , 7 ] and meat [ 8 ] are few.…”