Lactancia: la firma de los mamíferos

Abstract

Mammals are vertebrate animals whose main feature is breastfeeding the period in which females feed their young with milk from their mammary glands and thus protect them and help to ensure their survival. Breastfeeding starts immediately after birth of the offspring and extends until they can get their food alone; the time coincides with the decrease in the expression of the gene coding for the enzyme lactase that is which breaks lactose from milk thus allowing direct use of glucose metabolism of the individual. However, in the case of man, the expression of lactase extends for much of his life. This allows him to continue consuming milk, although it should be noted that that milk comes from different species to his and it is that, to tame cattle the discovery of the milking process meant a breakthrough for the human being, because that way he does not have to sacrifice the animal to obtain a highly nutritious food. This article aims to revise some aspects of the breastfeeding of the different subclasses of mammals, the importance of the milk and how the man has been able to get it from other species of mammals for their own consumption.

Curva de rendimiento y composición de leche en ovejas criollas de la Montaña de Guerrero, México

“…En este sentido, se desconocen aspectos básicos de su comportamiento reproductivo, producción y composición química de la leche. Los mamíferos presentan curvas en la producción de leche, que satisfacen las necesidades nutricionales de sus crías, cuyo crecimiento durante la primera etapa de su vida depende de la producción láctea de la madre (Bencini y Pulina 1997, Delgadillo 2016. En el ovino, representa el 75% del peso al destete del cordero y se ha determinado correlación significativa entre la secreción de leche de la madre y la ganancia de peso de la cría, por lo que la capacidad lechera de una oveja es un factor fundamental para destetar corderos más pesados (Benchohra et al 2013, Ochepo et al 2015.…”