Fecha/hora: 16/06/2024 07:24:22

Biblioteca(s): | INIA La Estanzuela.
Fecha corriente: | 21/02/2014
Fecha de la última actualización: | 01/10/2019
Autoria: | MENDOZA, A.; LA MANNA, A.; CRESPI, D.; CROWE, M.A.; CAVESTANY, D.
Afiliación: | ALEJANDRO FRANCISCO MENDOZA AGUIAR, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay; ALEJANDRO FRANCISCO LA MANNA ALONSO, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay; DANIELA MARIA CRESPI STRAUCH, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay; MARK A. CROWE, School of Agriculture, Food Science and Veterinary Medicine and Conway Institute, University College Dublin, Belfield, Dublin 4, Ireland.; DANIEL CAVESTANY BOCKING, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay.
Título: | Whole sunflower seeds as a source of polyunsaturated fatty acids for grazing dairy cows: effects on metabolic profiles and resumption of postpartum ovarian cyclicity.
Año de publicación: | 2009
Fuente/Imprenta: | Livestock Science, December 2009, Volume 119, Issue 1-3, Pages 183-193.
DOI: | 10.1016/j.livsci.2008.04.005
Idioma: | Inglés

Contenido:

Abstract:
Intake of polyunsaturated fatty acids (PUFA) could modify follicular dynamics and reduce the length of the interval from calving to first ovulation (ICOV) in dairy cows, associated with changes in metabolites (i.e. cholesterol) or hormones (i.e. IGF-I). To test this hypothesis, 48 cows were stratified in two groups (primiparous or multiparous) and within each group were randomly assigned to three treatments to begin at calving: 0 kg (SS0), 0.7 kg (SS0.7) and 1.4 kg (SS1.4) of whole sunflower seeds (WSS) per cow per day. The experimental period lasted for 60 days after calving and the diets, which consisted of direct grazing of improved pastures, whole-plant wheat silage and concentrates, were designed to be isocaloric and isoproteic (1.6 Mcal NEL/kg DM, 16.7% CP). Ovaries were examined by ultrasound three times per week from day 8 postpartum (PP) until first PP ovulation. Body condition score (BCS) was determined and blood samples were collected weekly from calving to characterize the metabolic profiles. In treatments SS0.7 and SS1.4, 7/8 and 6/8 primiparous cows ovulated the first follicular wave PP, compared with only 1/8 primiparous cow in treatment SS0, while there were no treatment differences in multiparous cows. The ICOV was 44, 21 and 19 days for the primiparous, and 22, 21 and 25 days for the multiparous cows, in treatments SS0, SS0.7 and SS1.4, respectively. Treatments had no effect on BCS, plasma IGF-I and metabolic profiles except that NEFA and urea were increased by WSS supplementation. Intake of PUFA (WSS up to 1.4 kg/day or 6.7% of the diet) during early lactation reduced the ICOV in primiparous grazing dairy cows in early lactation but not in multiparous cows, and while the precise mechanism for these results is unclear, it was not related to changes in the plasma concentrations of IGF-I or cholesterol.

Palabras-Clave: | CHOLESTEROL; FATTY ACIDS; FOLLICLE GROWTH; IGF-I; OVULATION; PASTOREO VACAS LECHERAS; POLYUNSATURATED; SEMILLAS DE GIRASOL.
Thesagro: | PARTO.
Categoría del tema: | L53 Fisiología Animal - Reproducción
Registro original: | INIA La Estanzuela (LE)
Ejemplares: | LE - (35201-1) - PXI - AP - DD - PP/Livestock Science/2009 -  -  - DIS