Effects of time and level of energy supplementation on intake and digestibility of low-quality tall fescue hay by sheep
| Autor: | R. B. Muntifering, M. G. Hayek, M. D. Howard, M. M. Howard |
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| Rok vydání: | 1992 |
| Předmět: | |
| Zdroj: | Canadian Journal of Animal Science. 72:51-60 |
| ISSN: | 1918-1825 0008-3984 |
| DOI: | 10.4141/cjas92-006 |
| Popis: | Effects of time and level of energy supplementation on forage intake, nutrient digestibility and ruminal pH were investigated with sheep fed low-quality tall fescue hay either alone (control; C) or supplemented (S) with concentrate at 10 (low; L) or 20% (high; H) of ad libitum forage intake; supplement was offered at 08:00 or 15:00 h. Supplementation increased (P < 0.05) digestible dry matter intake (DMI), total tract organic matter digestibility, N intake, and N digestibility, but decreased (P < 0.05) mean and minimum ruminal pH compared with C. Offering supplement at 08:00 h increased (P < 0.05) forage and total DMI, N intake, fecal N excretion and maximum ruminal pH, but lowered (P < 0.05) total tract digestibility of acid detergent fibre (ADF) and organic matter, and mean and minimum ruminal pH compared with 15:00 h. A high level of supplementation increased (P < 0.10) digestible DMI, postruminal digestion of neutral detergent fibre (NDF), and hemicellulose (HC), but lowered (P < 0.01) ruminal digestion of HC and NDF (P < 0.10), mean ruminal pH (P < 0.10) and total tract ADF digestion (P < 0.05) compared with L. These data suggest that the substitution effects of concentrate feeding on forage intake can be mitigated by changing the time of day when supplement is offered in relation to forage. Key words: Supplementary feeding, feed intake, digestibility, sheep |
| Databáze: | OpenAIRE |
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