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Establishment of a breeding season and evaluation of the reproductive performance of the Pantaneira horse in Mato Grosso do Sul, Brazil

Published online by Cambridge University Press:  01 August 2011

J. R. B. Sereno ,
S. A. Santos ,
C. E. S. N. Zúccari  and
M. C. M. Mazza
J. R. B. Sereno
Affiliation:
Pantanal Agricultural Research Center (CPAP) Caixa Postal 109, 79320-900, Corumbá, MS, Brazil
S. A. Santos
Affiliation:
Pantanal Agricultural Research Center (CPAP) Caixa Postal 109, 79320-900, Corumbá, MS, Brazil
C. E. S. N. Zúccari
Affiliation:
Pantanal Agricultural Research Center (CPAP) Caixa Postal 109, 79320-900, Corumbá, MS, Brazil
M. C. M. Mazza
Affiliation:
Pantanal Agricultural Research Center (CPAP) Caixa Postal 109, 79320-900, Corumbá, MS, Brazil
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Summary

The objective of this study was to establish a breeding season and to evaluate the reproductive performance of a horse herd of the Pantaneira breed from Nhumirim Ranch in the lowlands of Mato Grosso do Sul, Brazil. During the period 1990/91, the stallion was kept year-round with 17 mares. In the following year (91/92) a breeding season of seven months (Sept. 91 to Mar. 92) was established, in which the stallion and 15 mares were used. In the first period (90/91), the concentration of births occurred from September to December of 1991. The percentage of pregnancy and parturition observed in 90/91 and 91/92 for the male:female proportions of 1:17 and 1:15 were: 82.3, 100 and 86.7, 100%, respectively. In the breeding season from Oct. 91 to Feb. 92 with male/female ratios of A-1:11, B-1:10 and C-1:10, it was observed that the percentage of pregnancy was 90.9, 100 and 100%, respectively, with 100% parturition in the 3 groups. Independently of the number of females used (A-1:10, B-1:08, C-1:12), the rate of pregnancy obtained from the breeding season from Oct. 92 to Feb. 93 was 100%.

Resumen

Este trabajo fue realizado con el objetivo de evaluar el desempeño reproductivo y estabelecer la mejor época de la estación de monta para el plantel de caballos de la raza Pantaneira, pertenecientes a la hacienda Nhumirim, Pantanal Mato-Grossense, Brasil. Para la determinación de la estación de monta el padrillo permaneció durante el año entero (90/91) con las 17 yeguas. En el año siguiente (91/92) fue establecido un período de monta fijo con una duración inicial de siete meses (set./91 hasta mar./92), utilizando el mismo reproductor y 15 yeguas. En la ocasión en que el padrillo permaneció durante todo el año con las yeguas (90/91), los nacimientos ocurrieron de setiembre hasta diciembre de 1991. Las tasas de preñez y parición obtenidas en los períodos de monta 90/91 y 91/92 fueron de 82,3, 100 y 86,7, 100%, respectivamente. Se observó para la estación de monta de oct./91 hasta feb./92, cuando la proporción macho:hembra era: padrillo A-1:11, B-1:10 y C-1:10, que las tasas de preñez eran respectivamente, 90,9, 100 y 100%, con una tasa de parición para los tres grupos del 100%. La tasa de preñez durante la estación de monta de oct./92 hasta feb./93 fue del 100% para las tres proporciones sexuales adoptadas: padrillos A-1:10, B-1:08 y C-1:12.

Keywords

PantaneiraHorseBrazilReproductionConservationBreeding season
Type
Research Articles
Information
Animal Genetic Resources/Resources génétiques animales/Recursos genéticos animales , Volume 21 , April 1997 , pp. 43 - 48
Copyright
Copyright © Food and Agriculture Organization of the United Nations 1997

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