Détail de la notice
Titre du Document
Pasture availability and dry matter intake of lactating crossbred cows grazing elephant grass (Pennisetum purpureum, Schum.)
Auteur(s)
AROEIRA L. J. M. ; LOPES F. C. F. ; DERESZ F. ; ...
Résumé
The trial was carried out in Brazil, from April 1992 to October 1993. Availability and voluntary dry matter intake (DMI) of elephant grass (Pennisetum purpureum) were evaluated, using three groups of 24 crossbred lactating cows, grazing (4.5 cows/ha), during three days, paddocks varying in size (607, 494 and 417 m2) according to the resting periods adopted. The following treatments were studied: resting period of 30 days without (30W) and resting periods of 30 (30C), 37.5 (37.5C) and 45 (45C) days with 2 kg/day (20.6% crude protein CP) concentrate supplement. From October to June the elephant grass was the sole forage, while during the dry season, cows received sugarcane plus 1% urea as roughage supplement. The average chemical composition of sugarcane mixture was; 10.1% CP, 52.5% neutral detergent fiber (NDF), 31.6% acid detergent fiber (ADF), 58.5% in vitro dry matter digestibility (IVDMD) and the average daily intake was 1.3 ± 0.2% of body weight (BW). Mean elephant grass availabilities of paddocks 45C (2423±92 kg of DM/ha) was greater (p < 0.05) than (1745 and 1939 ± 92 kg of DM/ha) observed, respectively, for resting periods of 30 and 37.5 days. Daily herbage allowance was similar among treatments (11.3 ± 0.45 kg of DM/ cow), but varied according to the season and year, being higher in summer, intermediate in autumn and spring and lower in winter. As the dry season was more severe in winter and spring 1993, daily herbage allowance was smaller than that in 1992.
Editeur
Elsevier
Identifiant
ISSN : 0377-8401 CODEN : AFSTDH
Source
Animal feed science and technology A. 1999, vol. 78, n° 3-4, pp. 313-324 [bibl. : 1 p.1/4]
Langue
Anglais
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