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Zootecnia Tropical
Instituto Nacional de Investigaciones Agrícolas Venezuela
ISSN: 0798-7269
Vol. 25, No. 1, 2007, pp. 19-28
Bioline Code: zt07003
Full paper language: Spanish
Document type: Research Article
Document available free of charge

Zootecnia Tropical, Vol. 25, No. 1, 2007, pp. 19-28

 en Effect of bull on estrual behavior of Chinampo ( Bos taurus check for this species in other resources ) cows in a dry tropical region
Villavicencio, José Luís Espinoza; Amador, Rigoberto López; Espinosa, Alejandro Palacios; Pérez, Ricardo Ortega; Serrano, Narciso Ávila & Bernardo Murillo Amador

Abstract

In order to know the estrual behavior of the Chinampo cows, 24 cycling cows were used. A group (G1) was with a teaser bull, while the other one (G2) remained isolated from the male. Attempts to mount, made mounts, received but not accepted mounts, received and accepted mounts (AM), licking, butting, following, and smelling were recorded. Their accumulated occurrences were analyzed within the 30, 60 and 90 h after the beginning of a constant observation, since the 30 h after a protocol of estrous synchronization was finalized. Within the 30-60 h there were more events in G1. All of the events in both groups happened within 90 h. There were more secondary estrous interactions within the 30-60 h in G1. Until the 30 h, more AM in G1 was registered and between 60-90 h more AM in G2 were stated. Sixty percent of the cows of G1 and 18% of G2 initiated the estrus between 6:01-12:00 h. In G2, most of the estrus happened during the night. Sixty percent of the AM in G1 happened between 6:01-12:00 h, superior proportion to the one observed in G2. The proportion of cows with estrus duration minor of 8 h was greater in G1. We concluded that in male presence, the estrual behavior of Chinampo cows was concentrated in a shorter period and increased the proportion of estrus with minor duration of 8 h. The male affected the time of the estrus beginning and concentrated the AM during the morning.

Keywords
Male effect; Estrual behavior; Chinampo cows

 
 es Efecto del toro sobre el comportamiento estral de vacas Chinampas ( Bos taurus check for this species in other resources ) en una región tropical seca
Villavicencio, José Luís Espinoza; Amador, Rigoberto López; Espinosa, Alejandro Palacios; Pérez, Ricardo Ortega; Serrano, Narciso Ávila & Bernardo Murillo Amador

Resumen

Para conocer el comportamiento estral del bovino Chinampo se utilizaron 24 vacas ciclando. Un grupo (GI) estuvo con un toro protegido con un mandil de tela para evitar la cópula, mientras que el otro (G2) permaneció aislado del macho. Se contabilizaron intentos de monta, montas realizadas, montas recibidas no aceptadas, montas recibidas aceptadas (MA), lamidos, topeteos, acompañamientos y olfateos. Se analizaron sus ocurrencias acumuladas dentro de las 30, 60 y 90 h posteriores al inicio de una observación constante, que inició a partir de las 30 h de concluido un protocolo de sincronización de estros. Dentro de las 30-60 h de observación constante hubo más eventos en G1. Hubo más interacciones secundarias del estro dentro de las 30-60 h en G1. Hasta las 30 h se registraron más MA en G1 y entre 60-90 h se constataron más MA en G2. El 60% de las vacas de G1 y el 18% de G2 iniciaron estro entre las 6:01-12:00 h. En G2, la mayoría de los estros iniciaron durante la noche. El 60% de las MA en G1 ocurrieron entre las 6:01-12:00 h, proporción superior a la observada en G2. La proporción de vacas con duración del estro menor de 8 h fue mayor en G1. Se concluye que en presencia del macho, las vacas Chinampas concentraron su conducta estral en un periodo más corto y aumentó la proporción de estros con duración menor de 8 h. El macho afectó la hora de inicio del estro y concentró las MA durante la mañana.

Palabras-clave
Efecto macho; Comportamiento estral; Vacas Chinampas.

 
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Alternative site location: http://www.sian.inia.gob.ve/repositorio/revistas_ci/ZootecniaTropical/ztindice.htm

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