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- Title
Chemical composition, intake and in vitro gas production of the forage selected by cattle in a grassland of Northern Mexico.
- Authors
Murillo-Ortíz, M.; Reyes-Estrada, O.; Herrera-Torres, E.; Guerrero-Cervantes, M.; Nevárez-Carrasco, G.; Montoya-Escalante, R.; Juárez-Reyes, A. S.; Cerrillo-Soto, M. A.
- Abstract
The study was performed to determine the voluntary intake, nutritional value and in vitro gas production of the diet of grazing cattle during two periods of the year: wet (Jul-Dec), and dry (Jan-Jun). Four esophageal cannulated steers (320 ± 5.0 kg BW) were utilized to obtain extrusa samples. The collection was carried out at 700 during 45 min for a period of 4 days during Jul, Sept, Oct, Dec, Jan, Mar, Apr and Jun. The OM voluntary feed intake was determined from total fecal collection and the indigestible fraction of the forage after 48h incubation in the rumen. Chromium sesquoxide (8g/anim/14d) was dosed to the four steers to estimate total fecal production. The sampling was performed morning (700) and evening (1600) for 4 days during the months mentioned above. Estimations of CP, NDF, ADF and lignin were performed. In vitro gas production determinations were carried out by incubating 500 mg DM samples in calibrated 100 ml glass syringes using rumen fluid from two steers fed alfalfa hay ad lib. Gas production was recorded at 0, 3, 6, 15, 24, 36, 48, 72 and 96h. Data were fitted to the exponential equation: Y = a + b (1 - e -c*t). The variables were then analyzed using PROC GLM according to a completely randomized design. Nutritional level was increased (P < 0.05) during the wet season compared with that observed during the dry season. Dry matter intake was increased 82%, CP by 128%, and the gas production rate constant c by 35% during the wet vs. dry season. Potential degradability (a + b) was not affected (P > 0.05). Based on these data a supplementation schedule is warranted during the dry season to improve the body condition score of cattle. Means between rows with different superscritps differ (P<0.05).
- Subjects
MEXICO; CATTLE; FORAGE; ALFALFA as feed; ALFALFA; GRASSLANDS; NUTRITIONAL value; MORNINGNESS-Eveningness Questionnaire
- Publication
Journal of Animal Science, 2006, Vol 84, p23
- ISSN
0021-8812
- Publication type
Article