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Anim Reprod Sci. 2019 Jan;200:43-50. doi: 10.1016/j.anireprosci.2018.11.009. Epub 2018 Nov 19.

Daily administration of a GnRH analogue enhances sperm quality in bucks during the non-breeding season.

Author information

1
Departamento de Fisiología, Facultad de Veterinaria, Universidad de la República, Montevideo, Uruguay. Electronic address: giriboni02@gmail.com.
2
Department of Plant and Animal Production, Çine Vocational School, Aydın Adnan Menderes University, Aydın, Turkey.
3
Departamento de Reproducción Animal, Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria (INIA), Madrid, Spain.
4
Departamento de Fisiología, Facultad de Veterinaria, Universidad de la República, Montevideo, Uruguay.

Abstract

The aim of this study was to determine if daily administration of a GnRH analogue (buserelin acetate) to bucks during the non-breeding season increases testosterone concentration and improves sperm quality. Five bucks received a daily dose of buserelin for 10 days, starting on Day 0 (first administration), and another five bucks remained as controls. Testosterone concentrations were greater in treated than in control bucks during the first hours after buserelin administration (P = 0.05), but greater in controls 10 h later (P < 0.01). Sperm mass motility and percentage of motile sperm were greater in treated (3.9 ± 0.6 and 70.1 ± 7.9%, respectively) than in control bucks (1.0 ± 0.6, P < 0.01; 45.0 ± 7.9%, P < 0.05 respectively) on Day 4. Percentage of sperm with normal morphology tended to be greater in treated than in control bucks (81.8 ± 6.2% compared with 63.5 ± 6.4% respectively, P = 0.08). The treatment decreased the percentage of sperm with mid piece defect and with bent tail (7.0 ± 1.5% compared with 12.0 ± 1.5%; 8.0 ± 1.7% compared with 13.5 ± 1.7%, treated and control bucks, respectively, P = 0.05 for both). The square root percentage of sperm with loose but heads with normal structures tended to be less in treated than control bucks (1.3 ± 0.3% compared with 0.4 ± 0.3% respectively, P = 0.06). It was concluded that daily administration of buserelin during the non-breeding season led to a rapid increase in testosterone concentration and improved sperm quality.

KEYWORDS:

Goats; Hormonal treatment; Seasonality; Sperm; Testosterone

[Indexed for MEDLINE]

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