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《African Journal of Range and Forage Science》2013,30(3):197-200
The extractable and insoluble (bound to protein or neutral detergent fibre [NDF] proanthocyanadin (PA) of the tree species Brachystegia spiciformis (Musasa) harvested at different stages of growth from three sites with different soil types in Zimbabwe was analysed by the n-butanol-HCl method. Brachystegia spiciformis samples from one site showed significantly lower (P < 0.05) PA values than those from the other two sites. Higher (P < 0.01) proportions of insoluble PA (insoluble PA/total PA) were observed in leaves than in twigs. Substantial levels of PA were detected as bound tannins, ranging from 470–804g kg?1. These results suggest that measurement of bound condensed tannin is necessary when identifying forages containing condensed tannins. The higher contents of PA in the leaves that were harvested when mature than in young leaves could explain why animals prefer eating young rather than mature leaves of B. spiciformis. 相似文献
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N.M. Tainton 《African Journal of Range and Forage Science》2013,30(1):5-6
Grazing behaviour and diet selection of cattle were studied on a communally grazed floodplain and its adjacent wooded uplands in western Zambia to identify the interaction between basic herd management practices, foraging behaviour and body condition of cattle. On average, the cattle spent nine hours and 29 minutes (SD = 27 minutes) outside the kraal, with a range from about 8 hours in the dry season to almost 11 hours in the wet season, depending on the morning temperature and milking time. A significant (P<0.001) linear relationship between the time spent outside the kraal and time spent grazing was found. The Echinochloa spp.-Vossia cuspidata grass association was intensively grazed for the largest part of the year (44% of the total grazing time). During the flood season cattle grazed largely along the floodplain edge instead of the adjacent woodlands, which resulted in a negligible intake of browse. Body condition of all categories of cattle was significantly lower during the flood season. It was concluded that during this season cattle should graze more hours daily than they presently do, to minimise the drop in body condition as much as possible, and to make more intense use of the forage resource of the woodland. 相似文献
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《African Journal of Range and Forage Science》2013,30(3):265-270
Fifteen yearling goats of similar weight were used to evaluate the potential of Zizyphus spina-christi leaves as a supplement to goats fed on Cynodon dactylon grass. Animals were randomly assigned to five feeding regimes and individually stall-fed for a preliminary period of 14 days, followed by 14 days of feeding to determine dry matter intake and digestibility and a 3-month feeding period to determine body weight changes. The treatments were formulated based on leaf:grass ratios of 0%, 25%, 50%, 75% and 100%. Z. spina-christi leaves had higher crude protein and lower fibre content than C. dactylon grass (P < 0.05). Dry matter intake, digestibility and body weight changes increased significantly (P < 0.05) as the level of supplementation increased. Thus, Z. spina-christi foliage is a potential feed supplement in the dry season, as the dry season grasses are deficient in the required nutrients and cannot meet goat requirements. 相似文献
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