The effect of midwinter shearing on rumen digesta kinetics in highly prolific crossbred ewes
| Autor: | L.B.J. Šebek, H. Everts |
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| Rok vydání: | 2001 |
| Předmět: | |
| Zdroj: | Proceedings of the British Society of Animal Science. 2001:53-53 |
| ISSN: | 1752-7570 1752-7562 |
| DOI: | 10.1017/s175275620000435x |
| Popis: | The effective rumen degradability (ERD) of dietary protein is used to quantify the amount of dietary protein entering the small intestine of ruminants. Midwinter shearing of prolific ewes increases rumen degradation rate (Kd) of dietary protein (Šebek and Everts, 1999). However, these differences in Kd may be compensated by a different rumen passage rate (Kp), since cold exposure is often associated with increases in Kp. Kp can be estimated by use of an undegradable marker. This method, although reliable for fluids seems less reliable for solids. The objective of the present experiment was to quantify the effect of midwinter shearing on ERD in highly prolific ewes. As an alternative to the use of Kp, ERD of crude protein (CP) and of protein-free-organic-matter (OM_CP) were estimated from periodical changes in rumen volume partitioned as rumen degradable (Xd) and rumen undegradable (Xu) components. |
| Databáze: | OpenAIRE |
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