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Article Dans Une Revue Livestock Science Année : 2019

Intake, milk production and grazing behaviour responses of strip-grazing dairy goats to daily access time to pasture and to dehydrated lucerne supplementation

Résumé

The ability of grazing dairy goats to adapt to short daily access time to pasture is not well known, while, in practice, access time to pasture (AT) is often lower than 12 h/d. A 3-week trial was carried out in spring with 36Alpine dairy goats in mid-lactation to study the effect of a restriction of access time to pasture, coupled or notwith a dehydrated lucerne supplement. Three treatments were compared: (1) 7 h/d of access time to pasture,between milkings, without dehydrated lucerne (namely AT7); (2) 7 h/d of access time to pasture, betweenmilkings, with 371 g DM/d of dehydrated lucerne, distributed individually after evening milking (namelyAT7D); and (3) 11 h/d of access time to pasture, 7 h/d between milkings plus 4 h/d after evening milking,without dehydrated lucerne (namely AT11). The daily pasture allowance was 2.3 kg DM/goat at 4 cm aboveground level in each treatment. Each goat received 602 g DM/d of a commercial concentrate, given twice daily atmilking. Pasture intake decreased by 433 g DM/d (i.e. 18%) between AT11 and AT7 (P<0.01). Pasture intakealso decreased by 259 g DM/d between AT7 and AT7D (P<0.01), which means a substitution rate of 0.72between pasture and dehydrated lucerne. Milk production, and milk fat and protein concentrations were notaffected by AT (P>0.10). Milk production response to dehydrated lucerne was 0.82 kg of milk/kg DM. Grazingtime decreased by 2.5 h/d between AT11 and AT7 or AT7D (P<0.001). The pasture intake rate averaged 272 gDM/h and tended to increase between AT11 and AT7 (P=0.08). It is concluded that an access time to pasture of7 h/d may be sufficient for lactating dairy goats receiving 600 g/d of concentrate and grazing high-qualitypastures. Supplying 400 g/d of dehydrated lucerne has a much stronger positive effect on milk production thanan additional grazing period of 4 h after evening milking.
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hal-02294940 , version 1 (20-07-2022)

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Paternité - Pas d'utilisation commerciale

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Alexia Charpentier, Hugues Caillat, Francois Gastal, Remy Delagarde. Intake, milk production and grazing behaviour responses of strip-grazing dairy goats to daily access time to pasture and to dehydrated lucerne supplementation. Livestock Science, 2019, 229, pp.90-97. ⟨10.1016/j.livsci.2019.09.019⟩. ⟨hal-02294940⟩
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