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In dual-purpose subtropical goats, 1 h of extra-light given from 16 to 17 h after dawn (pulse of light) in winter stimulates milk yield
Published online by Cambridge University Press: 22 July 2019
Abstract
This research communication addresses the hypothesis that in dual-purpose goats, exposure to 1 h of extra-light given from 16 to 17 h after dawn (pulse of light) in winter stimulates milk yield. One group of goats was maintained under natural short photoperiod (natural day; ND (n = 7)). Another group of lactating females was submitted to an artificial long-day photoperiod consisting of 16 h light and 8 h darkness (long days; LD (n = 7)). A third group of females received one single hour of extra-light 16 h after the fixed dawn (pulse of light; PL (n = 6)). Goats from LD and PL yielded 30% more milk than goats from ND. Mean percentages of fat, protein and lactose contents in milk did not differ between the 3 groups at any stage of lactation, but these components in grams/day were higher in goats from PL than in the others two groups within the first 45 d of lactation. In conclusion, dual-purpose lactating goats that started their lactation during natural short days, the daily exposition to a 1-h pulse of light is sufficient to stimulate milk yield compared to females maintained under natural short photoperiod.
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- Copyright © Hannah Dairy Research Foundation 2019
References
Bocquier, F, Thériez, M, Kann, G and Delouis, C (1986) Influence de la photopériode sur la partition de l’énergie nette entre la production laitière et les réserves corporelles chez la brebis traite. Reproduction Nutrition Development 26, 389–390.Google Scholar
Chemineau, P, Normant, E, Ravault, JP and Thimonier, J (1986) Induction and persistence of pituitary and ovarian activity in the out-of-season lactating dairy goat after a treatment combining a skeleton photoperiod, melatonin and the male effect. Journal of Reproduction and Fertility 78, 497–504.Google Scholar
Flores, MJ, Flores, JA, Elizundia, JM, Mejia, A, Delgadillo, JA and Hernandez, H (2011) Artificial long-day photoperiod in the subtropics increases milk production in goats giving birth in late autumn. Journal of Animal Science 89, 856–862.10.2527/jas.2010-3232Google Scholar
Flores, MJ, Delgadillo, JA, Flores, JA, Pastor, FJ, Duarte, G, Vielma, J and Hernández, H (2015) Artificial long days increase milk production in subtropical lactating goats managed under extensive grazing conditions. Journal of Agricultural Science 153, 335–342.Google Scholar
Garcia-Hernandez, R, Newton, G, Horner, S and Nuti, LC (2007) Effect of photoperiod on milk yield and quality and reproduction in dairy goats. Livestock Science 110, 214–220.Google Scholar
Hart, IC (1975) Concentrations of prolactin in serial blood samples from goats before, during and after milking throughout lactation. Journal of Endocrinology 64, 305–3012.Google Scholar
Lacasse, P, Ollier, S, Lollivier, V and Boutinaud, M (2016) New insights into the importance of prolactin in dairy ruminants. Journal of Dairy Science 99, 864–874.Google Scholar
Ravault, JP and Ortavant, R (1977) Light control of prolactin secretion in sheep. Evidence for a photoinducible phase during a diurnal rhythm. Annales de Biologie Animal, Biochimie Biophysique 17, 459–473.Google Scholar
Santucci, PM and Maestrini, O (1985) Body condition of dairy goats in extensive systems of production: method of estimation. Annales de Zootechnie 34, 473–474.Google Scholar
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