Titre : | Energy supplementation and herbage allowance effects on daily intake in lactating mares (2015) |
Auteurs : | Claire Collas ; B. Dumont ; R. Delagarde ; William Martin-Rosset ; G. Fleurance |
Type de document : | Article : texte imprimé |
Dans : | JOURNAL OF ANIMAL SCIENCE (vol.93, 2015-05-01) |
Article en page(s) : | p.2520-2529 |
Langues: | Anglais |
Mots-clés : |
Equivoc Complément Alimentaire ; Énergie ; Fourrage Vert ; Jument ; Lactation ; Nutrition ; Pâturage |
Résumé : | Little is known about how to manage grazing horses, including the thresholds under which energy supplementation is required. Here we investigated the effects of daily herbage allowance (DHA) and energy supplementation (ES) on daily herbage intake in lactating mares of light breeds grazing high-quality regrowth during summer. Three contrasting DHA, low (LOW), medium (MED), and high (HIGH), that is, 35.0, 52.5, and 70.0 g DM?kg BW\2261?d\2261, respectively, were obtained by adjusting pasture strip width. Eighteen Anglo-Arab and French Saddle lactating mares were either supplemented with 2.6 kg DM barley/d (SUP group; n = 9) or left nonsupplemented (NSUP group; n = 9) throughout the experiment. For 3 successive 2-wk periods, 3 groups of SUP mares (n = 3) and 3 groups of NSUP mares (n = 3) grazed each DHA according to a 3 3 Latin square design. Pregrazing sward surface height (SSH) was similar between treatments (26.6 cm), but postgrazing SSH differed significantly between each DHA (2.9, 4.4, and 5.7 cm for LOW, MED, and HIGH, respectively; P < 0.001). Herbage DMI (HDMI) increased linearly from 18.5 to 23.4 g DM?kg BW\2261?d\2261 with increasing DHA (i.e., 0.13 kg DM eaten/kg DM of herbage offered; P < 0.001) independently of ES and with no significant ES DHA interaction. This increase in HDMI resulted from an increase in grazing time between LOW (961 min/d) and MED and HIGH (1,021 min/d; P < 0.01) and from an increase in intake rate between LOW and MED (11.8 g DM/min) and HIGH (13.6 g DM/min; P < 0.01). Total digestible DMI (TDDMI) and NE intake (NEI) increased linearly from 12.3 to 15.2 g DM?kg BW\2261?d\2261 and from 136.6 to 165.8 kJ?kg BW\2261?d\2261 with increasing DHA (P < 0.001), respectively. Total digestible DMI and NEI were significantly lower for NSUP than for SUP mares: 12.5 vs. 14.9 g DM?kg BW\2261?d\2261 (P < 0.01) and 134.6 vs. 166.5 kJ?kg BW\2261?d\2261 (P < 0.001), respectively. Whereas SUP mares always met their energy requirements, NSUP mares no longer met theirs when DHA fell below 66 g DM?kg BW\2261?d\2261 (i.e., 39 kg DM?mare\2261?d\2261). |
Cote du document numérique : | 16986 |
Classement cheval : | B08/B20 |