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. 2019 Jul;51(6):1627-1635.
doi: 10.1007/s11250-019-01856-8. Epub 2019 Feb 26.

Reproductive behavior in hair sheep rams under tropical conditions

Jesús Ricardo Aké-Villanueva  1 , Jesús Ricardo Aké-López  1 , Juan Gabriel Magaña-Monforte  1 , José Candelario Segura-Correa  2
Affiliations

Reproductive behavior in hair sheep rams under tropical conditions

Jesús Ricardo Aké-Villanueva et al. Trop Anim Health Prod. 2019 Jul.

Abstract

The reproductive efficiency of sheep herds depends to a great extent on the ram. Male reproductive evaluation allows to select for the best and eliminate those with reproductive problems. The objective was to evaluate the effect of breed and age group on the reproductive behavior of hair sheep rams in the tropics of Mexico. Pelibuey (n = 42), Blackbelly (n = 30), Dorper (n = 44), and Katahdin (n = 30) rams of two age groups: young (n = 74, 1-1.5 years old) and adult (n = 72, 2-4 years old) were evaluated. Serving capacity (10-min duration) and breeding soundness evaluation (BSE) tests were carried out in each ram. In the first test, rams were classified as suitable and unsuitable, and in the BSE test, they were classified as satisfactory, questionable, or unsatisfactory. The response variables were analyzed using chi-square test or analyses of variance (ANOVA). ANOVA included the fixed effects of breed, age group, and their interaction. In the serving capacity test, 79.5% of the rams were considered suitable, with no breed differences (P > 0.05). Adult rams (90.3%) had the highest proportion of suitable rams (P < 0.05). In the BSE test, 80.2% of the rams were satisfactory; only breed being significant (P < 0.05). Pelibuey breed had the highest proportion of satisfactory rams (91.4%). Breed × age interaction was no significant for any trait. After serving capacity and BSE tests, a high proportion of rams was found not suitable for reproduction (36.3%), which is expected to cause low fertility in the flock.

Keywords: BSE test; Scrotal circumference; Seminal traits; Serving capacity test.

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References

    1. Aguirre, V., Orihuela, A., Vázquez, R., 2007. Effect of semen collection frequency on seasonal variation in sexual behavior, testosterone, testicular size and semen characteristics of tropical hair rams (Ovis aries), Tropical Animal Health and Production, 39, 271-277. - DOI - PubMed
    1. Aké-López, J.R., Aké-Villanueva, N.Y., Segura-Correa, J.C., Aké-Villanueva, J.R. and Montes-Pérez, R.C. (2016). Effect of age and season on semen traits and serving capacity of Pelibuey rams under tropical conditions, Livestock Research for Rural Development, 28, #166. http://www.lrrd.org/lrrd28/9/akel28166.html . Accessed 02 Feb 2016.
    1. Aké-López, J.R., Aké-Villanueva, N.Y., Aké-Villanueva, J.R. and Segura-Correa, J.C., 2017. Evaluación reproductiva del macho Ovino, (Editorial Académico Española, Spain).
    1. Alexander, B.M., Cockettb, N.E., Burton, D.J., Hadfield, T.L., Moss, G.E., 2012. Reproductive performance of rams in three producer range flocks: Evidence of poor sexual behavior in the field, Small Ruminant Research, 107, 117-120. - DOI
    1. Arroyo, L.J., 2011. Estacionalidad reproductiva de la oveja en México, Tropical and Subtropical Agroecosytems, 14, 829-845.

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