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Agrociencia
versión On-line ISSN 2521-9766versión impresa ISSN 1405-3195
Agrociencia vol.41 no.3 Texcoco abr./may. 2007
Animal science
Effects of physiological and management factors on the milk composition of rambouillet ewes
1Facultad de Agronomía. Universidad Autónoma de San Luís Potosí. Apartado Postal 32. San Luis Potosí, San Luis Potosí. (simba646@hotmail.com).
2Ganadería. Campus Montecillo. Colegio de Postgraduados. 56230. Montecillo, Estado de México. (glatohe@colpos.mx).
3Facultad de Medicina. Universidad Autónoma de San Luis Potosí. Avenida Venustiano Carranza. Número 345. 78210. San Luis Potosí, San Luis Potosí. (mandevip@uaslp.mx)
The effects of physiological and management factors on the milk composition of Rambouillet ewes under confined management at the Sheep Unit, Agronomy Faculty, Universidad Autónoma de San Luis Potosí, México, were evaluated. Two treatments were randomly assigned to 45 single and twin-rearing ewes, 2-5 years old: 6 and 8 weeks of lactation, which were the dates when the lambs were weaned. Milk samples were taken during lactation (weeks 1, 3, 6, 8, and 12), and chemically analyzed using standard laboratory procedures for protein, fat, total solids, ash and lactose percentages. Statistical analysis was performed utilizing a model that included the fixed effects of lambing number (LN: 1-3+), birth type (BT: single, twins), lamb sex (LS: ram lambs, ewe lambs, utilizing a separate model), weaning date (WD: 6 weeks, 8 weeks), and first order interactions. Overall means for milk protein, fat, total solids, ash, and lactose were 5.2±0.5%, 5.6±2.1%, 16.7±2.1%, 0.91±0.06%, and 4.5±0.4%. Consistent significant (p≤0.01) effects of LN, BT, and WD were observed for protein, fat and total solids. An LS effect (p≤0.05) was found only on lactose. Significant (p≤0.01) LN×WD and BT×WD interactions showed an influence on milk fat and total solids.
Key words: Environmental factors; ewes; intensive management; milk components
Se evaluaron los efectos de factores fisiológicos y de manejo en la composición de la leche de ovejas Rambouillet en condiciones de confinamiento en la Unidad de Ovinos de la Facultad de Agronomía de la Universidad Autónoma de San Luis Potosí, México. Se asignaron dos tratamientos al azar a 45 ovejas con crías de partos sencillos o gemelares, de 2-5 años de edad, 6 y 8 semanas de lactancia, que fueron las fechas cuando se destetaron los corderos. Se tomaron muestras de leche durante la lactancia (semanas 1, 3, 6, 8, y 12) y se analizaron químicamente usando procedimientos estándar de laboratorio para los porcentajes de proteína, grasa, sólidos totales, ceniza y lactosa. Se realizó un análisis estadístico utilizando un modelo que incluyó los efectos fijos del número de parto (NP: 1-3+), tipo de parto (TP: sencillo, gemelar), sexo del cordero (SC: macho, hembra, utilizando un modelo separado), fecha de destete (FD: 6 semanas, 8 semanas), e interacciones de primer orden. Las medias generales para la proteína de leche, grasa, sólidos totales, cenizas y lactosa fueron 5.2±0.5%, 5.6±2.1%, 16.7±2.1%, 0.91±0.06% y 4.5±0.4%. Se observaron efectos significativos consistentes (p≤0.01) de NP, TP y FD) NP×FD y TP×FD mostraron influencia en la grasa de la leche y en los sólidos totales. en proteína, grasa y sólidos totales. Se encontró un efecto de SC (p≤0.05) sólo en lactosa. Las interacciones significativas (p≤0.01) NP×FD y TP×FD mostraron influencia en la grasa de la leche y en los sólidos totales.
Palabras clave: Factores ambientales; ovejas; manejo intensivo; componentes de la leche
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Received: November 2005; Accepted: October 2006
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