Fecha/hora: 11/06/2024 21:25:15

Biblioteca(s): | INIA Treinta y Tres.
Fecha corriente: | 11/11/2019
Fecha de la última actualización: | 11/11/2019
Autoria: | LÓPEZ-MAZZ; BALDI, F.; QUINTANS, G.; KENYON, P.R.; CORREA, O.; REGUEIRO, M.; ÁLVAREZ-OXILEY, A.; BANCHERO, G.
Afiliación: | CARLOS LÓPEZ-MAZZ, Departamento de Producción Animal y Pasturas. Facultad de Agronomía, Montevideo, Uruguay.; FERNANDO BALDI, Facultad de Ciencias Agrarias e Veternárias, Jaboticabal, Sao Paulo, Brazil.; GRACIELA QUINTANS ILARIA, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay; P.R. KENYON, Sheep Research Centre, Institute of Veterinary and Biomedical Sciences. Massey University, Palmerston, North, New Zealand.; O. CORREA, Departamento de Parasitología Veterinaria, Facultad de Veterinaria, Montevideo, Uruguay.; M. REGUEIRO, Departamento de Producción Animal y Pasturas. Facultad de Agronomía, Montevideo, Uruguay.; A. ÁLVAREZ-OXILEY, Departamento de Producción Animal y Pasturas. Facultad de Agronomía, Montevideo, Uruguay.; GEORGGET ELIZABETH BANCHERO HUNZIKER, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay.
Título: | Efecto sobre el comportamiento productivo, reproductivo y la respuesta al desafío parasitario en corderas cuyas madres fueron esquiladas a los 50 días de gestación.
Año de publicación: | 2019
Fuente/Imprenta: | In: QUINTANS, G.; IEWDIUKOW, M. (Ed.). Primer Seminario Técnico de Programación Fetal. Montevideo (UY): INIA, 2019. p. 99-109.
Série: | (INIA Serie Técnica; 252)
ISSN: | 1688-9266
Idioma: | Español

Contenido:

ABSTRACT
This study evaluated the effect of shearing ewes at 50 day of gestation on the growth, reproductive behavior and response to a gastrointestinal parasite challenge in the
female offspring from weaning (104 d) to 18 months old. Fifty-seven Polwarth female lambs were used, 22 single (S) and 35 twin (T) born to ewes either shorn at 50 days of pregnancy (PS, n = 23) or shorn at 62 days post-partum (U, control, n = 34) resulting in four sub-groups: SPS: single female lambs born to ewes shorn at 50 days of pregnancy (n = 8), SU: single female lambs born to ewes shorn postpartum (n = 14), TPS: twin females lambs born to ewes shorn at 50 days of pregnancy (n = 15) or TU: twin female lambs born to ewes shorn postpartum (n = 20). All progeny was managed together under improved pasture with a minimum forage allowance of 6% live weight on dry matter basis. Body weight, body condition score (BCS) and fecal eggs count was recorded every 14 d from weaning to 18 months of
age. Concentrations of progesterone were measured weekly (from 4 to 10 months of age and from 14 to 18 months of age) to establish the onset of puberty. Ovulation rate (545 ± 1.0 d old) was recorded. Prepartum shearing did not affect the age at puberty or the ovulation rate, but those female lambs born as singles were more precocious (P = 0.03) and heavier (P = 0.02) at puberty than twin born female lambs. Both the average value of parasite egg count (P = 0.07) and the Famacha index (P = 0.02) for the entire study period were lower in female lambs born to prepartum shorn ewes than those born to postpartum shorn ewes. In conclusion, shearing at 50 days of gestation did not affect the growth or the reproductive behavior of female offspring. However, female lambs born from ewe shorn during gestation showed a better response to the parasite challenge, but further research is required to confirm this.

Palabras-Clave: | CORDERAS; CRECIMIENTO; ESQUILA TEMPRANO; INMUNIDAD; REPRODUCCIÓN.
Categoría del tema: | L53 Fisiología Animal - Reproducción
URL: | http://www.ainfo.inia.uy/digital/bitstream/item/13790/1/St-252-p-99-109-Lopez-Mazz.pdf
Registro original: | INIA Treinta y Tres (TT)
Ejemplares: | TT - (102921-1) - INI - PL - DD - UY/INIA/ST/252/2019 -  - st-252 - DIS