Asian-Australasian Journal of Animal Sciences
- 제4권1호
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- Pages.79-83
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- 1991
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- 1011-2367(pISSN)
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- 1976-5517(eISSN)
DOI QR Code
EFFECT OF FEEDING PATTERN ON DIURNAL VARIATION IN FAECAL CHROMIC LEVEL WHEN USING CONTROLLED RELEASE DEVICES IN SHEEP
- Lee, G.J. (NSW Agriculture and Fisheries Agricultural Research Centre) ;
- Mortimer, S.I. (NSW Agriculture and Fisheries Agricultural Research Centre)
- 투고 : 1990.08.29
- Accepted : 1990.12.20
- Published : 1991.03.01
Abstract
Diurnal variation in faecal chromic oxide levels was estimated from 4 hourly faecal sampling of 56 wethers allotted to one of six different feeding patterns. Sampling occurred on days 6 and 7 (Period 1) after a controlled release device was administered, and was repeated on days 14 and 15 (Period 2) following re-randomisation of the wethers to the feeding patterns. Increasing the frequency of feeding tended to be associated with higher faecal chromic oxide levels (p < 0.05), particularly in wethers fed thrice daily at 8 hour intervals. There was no interaction between feeding pattern and period, sampling day or time within-day. There were significant period x time within-day (p < 0.05) and day x time within-day (p < 0.001) interactions, indicating that variation in faecal chromic oxide between sample times was not consistent. This implies that sampling at any time of day is unlikely to result in a biased estimate of pasture intake, providing sufficient samples are collected. Significant period (p < 0.001) and period x day (p < 0.01) effects were associated with slow faecal chromic oxide equilibration in period 1. Equilibration did not occur until after day 7, indicating a need for caution when commencing sampling.