Fecha/hora: 01/06/2024 07:46:20

Biblioteca(s): 	INIA La Estanzuela; INIA Treinta y Tres.	
Fecha corriente: 	17/04/2015	
Fecha de la última actualización: 	11/02/2019	
Autoria: 	BANCHERO, G.; MILTON, J.T.B.; LINDSAY, D.R.; MARTIN, G.B.; QUINTANS, G.	
Afiliación: 	GEORGGET ELIZABETH BANCHERO HUNZIKER, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay; GRACIELA QUINTANS ILARIA, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay.	
Título: 	Colostrum production in ewes: a review of regulation mechanisms and of energy supply.	
Año de publicación: 	2015	
Fuente/Imprenta: 	Animal, v. 9, n. 5, p. 831-837. 2015.	
ISSN: 	1751-732X.	
DOI: 	10.1017/S1751731114003243.	
Idioma: 	Inglés	
Notas: 	Article history: Received 19 June 2014; Accepted 1 December 2014; published 2015.	
Contenido: 	In sheep production systems based on extensive grazing, neonatal mortality often reaches 15% to 20% of lambs born, and the mortality rate can be doubled in the case of multiple births. An important contributing factor is the nutrition of the mother because it affects the amount of colostrum available at birth. Ewes carrying multiple lambs have higher energy requirements than ewes carrying a single lamb and this problem is compounded by limitations to voluntary feed intake as the gravid uterus compresses the rumen. This combination of factors means that the nutritional requirements of the ewe carrying multiple lambs can rarely be met
by the supply of pasture alone. This problem can overcome by supplementation with energy during the last week of pregnancy, a treatment that increases colostrum production and also reduces colostrum viscosity, making it easier for the neonatal lamb to suck.
In addition, litter size and nutrition both accelerate the decline in concentration of circulating progesterone that, in turn, triggers the onsets of both birth and lactogenesis, and thus ensures the synchrony of these two events. Furthermore, the presence of colostrum in the gut of the lamb increases its ability to recognize its mother, and thus improves mother–young bonding. Most cereal grains that are rich in energy in the form of starch, when used as supplements in late pregnancy will increase colostrum production by 90% to 185% above control (unsupplemented) values. Variation among types of cereal grain in the response they induce may be due to differences in the amount of starch digested post-ruminally. As a percentage of grain dry matter intake, the amount of starch entering the lower digestive tract is 14% for maize, 8.5% for barley and 2% for oats. Supplements of high quality protein from legumes and oleiferous seeds can also increase colostrum production but they are less effective than cereal grains. In conclusion, short-term supplementation before parturition, particularly with energy-rich concentrates, can improve
colostrum production, help meet the energy and immunological requirements for new-born lambs, and improve lamb survival.	
Palabras-Clave: 	CEREALS; COLOSTRUM; DISMINUCIÓN DE CONCENTRACIÓN DE PROGESTERONA; GESTACIÓN; GESTACIÓN MÚLTIPLE; LACTOGÉNESIS; MOMENTO DE PARTO; MORTALIDAD NEONATAL DE CORDEROS; PRODUCCIÓN DE CALOSTRO; PROTEIN; REQUERIMIENTOS DE CALOSTRO; SHEEP; STARCH; SUPERVIVENCIA NEONATAL DE CORDEROS; SUPLEMENTACIÓN CON GRANO; SUPLEMENTACIÓN CON PASTOREO; SUPLEMENTACIÓN ENERGÉTICA; SUPLEMENTACIÓN PREPARTO; SUPLEMENTACIÓN PROTEICA.	
Thesagro: 	CAMPO NATURAL; FISIOLOGÍA ANIMAL; PRODUCCIÓN OVINA.	
Categoría del tema: 	--
L53 Fisiología Animal - Reproducción	
Registro original: 	INIA La Estanzuela (LE)	
Ejemplares: 	LE - (100940-1) - PXI - AP - DD -  -  -  - DIS
TT - (100776-1) - PXI - AP - DD - PP/QUINTANS/2015/1 -  - Arb/Q/15/1 - DIS