Pre-breeding nutritional supplementation in bucks increases testosterone and improves fertility in goats under semi-extensive conditions

Luz María Tejada; Natalia López-Magaña; Dolores López-Magaña; Philippe Chemineau; José Alberto Delgadillo

doi:10.1590/1984-3143-AR2026-0063

Short Communication

Pre-breeding nutritional supplementation in bucks increases testosterone and improves fertility in goats under semi-extensive conditions

Luz María Tejada; Natalia López-Magaña; Dolores López-Magaña; Philippe Chemineau; José Alberto Delgadillo

http://dx.doi.org/10.1590/1984-3143-AR2026-0063 Anim Reprod, vol.23, n4, e20260063, 2026

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Abstract

In subtropical latitudes, goats are managed under semi-extensive systems grazing natural vegetation without supplementation. During the dry season, reduced forage availability leads to undernutrition and reduced breeding activity in bucks. This study evaluated whether pre-breeding nutritional supplementation enhances testosterone and reproductive performance in bucks joined with anestrous females. On 15 March, bucks were assigned to two groups (n = 6 each) and placed with separate flocks of 90–100 females grazing 9 h/day. Control bucks received no supplementation; supplemented bucks received 600 g/day of concentrate from 15 March to 30 May. Males were fitted with aprons until 1 June to prevent mating. Testosterone was low and similar between groups in March and April (P > 0.05). In supplemented bucks, testosterone increased from mid-May to mid-June, reaching higher than controls (P < 0.05). Females joined with supplemented bucks had higher fertility (71% vs. 53%; P < 0.01), earlier parturition, and a shorter kidding period (P < 0.0001). In conclusion, pre-breeding supplementation increases testosterone, improves fertility, and advances and synchronizes kidding under semi-extensive conditions.

Keywords

reproductive seasonality, undernutrition, male effect, goat production systems

References

Abecia JA, Chemineau P, Delgadillo JA. Long term male effect. In: Simoes J, editor. Encyclopedia of livestock medicine for large animal and poultry production. Cham: Springer Nature; 2025. p. 1-6. https://doi.org/10.1007/978-3-031-52133-1_214-1.

Delgadillo JA, Sifuentes PI, Flores MJ, Espinoza-Flores LA, Andrade-Esparza JD, Hernández H, Keller M, Chemineau P. Nutritional supplementation improves the sexual response of bucks exposed to long days in semi-extensive management and their ability to stimulate reproduction in goats. Animal. 2021;15(2):100114. https://doi.org/10.1016/j.animal.2020.100114. PMid:33573958.

Duarte G, Flores JA, Malpaux B, Delgadillo JA. Reproductive seasonality in female goats adapted to a subtropical environment persists independently of food availability. Domest Anim Endocrinol. 2008;35(4):362-70. https://doi.org/10.1016/j.domaniend.2008.07.005. PMid:18790595.

García-Cruz OU, Tejada LM, Flores MJ, Nava-Rivera LE, López-Magaña N, Hernández H, Keller M, Chemineau P, Santiago-Moreno J, Delgadillo JA. A semi-extensive management system reduces plasma testosterone concentrations, sexual behavior and sperm production in male goats from subtropical latitudes. Anim Prod Sci. 2022;62(17):1683-91. https://doi.org/10.1071/AN22066.

Hötzel MJ, Walkden-Brown SW, Fisher JS, Martin GB. Determinants of the annual pattern of reproduction in mature male Merino and Suffolk sheep: responses to a nutritional stimulus in the breeding and non-breeding seasons. Reprod Fertil Dev. 2003;15(1-2):1-9. https://doi.org/10.1071/RD02024. PMid:12729498.

Mexico. Secretaría de Agricultura, Ganadería, Desarrollo Rural, Pesca y Alimentación. NOM-062-ZOO-1999. Diario Oficial de la Federación; Mexico; 2001.

Tejada LM, García-Cruz OU, Nava-Rivera LE, López-Magaña N, Hernández H, Lopez-Magaña N, Keller M, Chemineau P, Santiago-Moreno J, Delgadillo JA. Solar exposure reduces plasma testosterone concentrations, sperm quality and fertility in male goats from subtropical latitudes. Trop Subtrop Agroecosystems. 2025;28(2):1-14. https://doi.org/10.56369/tsaes.6241.

Walkden-Brown SW, Restall BJ, Norton BW, Scaramuzzi RJ. The ‘female effect’ in Australian cashmere goats: effect of season and quality of diet on the LH and testosterone response of bucks to oestrous does. J Reprod Fertil. 1994;100(2):521-31. https://doi.org/10.1530/jrf.0.1000521. PMid:8021873.

Walkden-Brown SW, Restall BJ, Henniawati. The male effect in the Australian cashmere goat. 3. Enhancement with buck nutrition and use of oestrous females. Anim Reprod Sci. 1993;32(1-2):69-84. https://doi.org/10.1016/0378-4320(93)90058-Y.

Submitted date:
04/01/2026

Accepted date:
07/15/2026

Pre-breeding nutritional supplementation in bucks increases testosterone and improves fertility in goats under semi-extensive conditions

Luz María Tejada; Natalia López-Magaña; Dolores López-Magaña; Philippe Chemineau; José Alberto Delgadillo

Abstract

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