ABSTRACT. Twelve Pelibuey ewes were used to evaluate the effect of replacing soybean meal (PS) with a handmade product made of fish (HP) on milk yield and composition and body weight of their suckling lambs. The experimental period was carried out during the first three weeks of lactation, where changes in body weight, feed intake and milk production and composition were evaluated in sheep, and changes in body weight were evaluated on 22 of their lambs (initial wt = 2.52 ± 0.05 kg). The control diet and test diet were formulated to meet nutrient requirements of ewes during early lactation. The level of inclusion of PS and HP in diets was 7 and 3.5%, respectively. HP was elaborated with fish by-products (whole fish, heads, tails, and backbone). The chemical composition of HP averaged 50.8 ± 7.7% CP, fat 9.4 ± 0.8% and 22.7 ± 5.9% ash. There were no differences in BW changes and milk production. The protein content in milk and final body weight of suckling lambs were greater (P < 0.01) in the case of HP when compared to PS. It was concluded that HP is a suitable substitute of PS in lactating ewes and it does not affect DM intake and milk performance. An increase of protein concentration in milk from ewes that received HP may result in a greater body weight of the lambs during the first 21 days of age.Key words: suckling lambs, milk, body weight. RESUMEN.Se utilizaron 12 borregas raza Pelibuey para evaluar el efecto de la sustitución de la pasta de soya (PS) con una harina de pescado obtenida artesanalmente (HP) sobre producción y composición de la leche y el peso de sus corderos lactantes. La evaluación se realizó en las primeras tres semanas de lactación, donde se evaluaron los cambios de peso corporal, consumo de alimento, producción y composición de leche, así como los cambios de peso corporal de sus corderos lactantes. La dieta testigo (PS) y la dieta prueba (HP) fueron formuladas para cubrir los requerimientos de borregas en lactación temprana. La HP fue elaborada con subproducto de pescado (pescados enteros, cabezas, colas y columnas vertebrales). La composición química promedio del HP fue de: 50,8 ± 7,7% de PC; 9,4 ± 0,8% de grasa y 22,7 ± 5,9% de ceniza. No hubo diferencias en el peso corporal y producción de leche de las borregas. El contenido de proteína en leche y peso de los corderos de las borregas alimentadas con HP fue mayor (P < 0,01) comparadas con las del grupo PS. Se concluyó que es posible sustituir la pasta de soya con harina de pescado artesanal sin alterar el comportamiento productivo en borregas en lactación. Incrementos en la concentración de proteína en leche con HP puede ser reflejado en el peso de los corderos lactantes durante sus primeros 21 días de vida.Palabras clave: corderos lactantes, leche, peso corporal.
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