effects of shearing and Ralgro implants on feedlot performance of lambs during the summer

To evaluate the effects of shearing and Ralgro ® implants on the performance of fast-gaining feedlot lambs during the summer, 84 group-fed crossbred wether lambs (34.8 ± 1.8 kg) were shorn on day 0 of the feeding period (ES), shorn 3 wk later (LS), or left unshorn (NS), and either implanted with 12 ...

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Veröffentlicht in:Canadian journal of animal science 1990-09, Vol.70 (3), p.743-750
Hauptverfasser: Lane, S.F, Kemp, R.A
Format: Artikel
Sprache:eng
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Zusammenfassung:To evaluate the effects of shearing and Ralgro ® implants on the performance of fast-gaining feedlot lambs during the summer, 84 group-fed crossbred wether lambs (34.8 ± 1.8 kg) were shorn on day 0 of the feeding period (ES), shorn 3 wk later (LS), or left unshorn (NS), and either implanted with 12 mg Ralgro on day 0 (R) or not implanted (C). Lambs were blocked by initial weight. Heavy and light pens of lambs were shipped to market when the average weight within a pen was 52 kg after 40 and 55 d, respectively. Between days 0 and 40, mean average daily gain (ADG) of all lambs was 384 g and feed conversion was 4.38 kg dry matter kg −1 gain. During the first 40 d of the feeding period, shearing did not affect ADG (P > 0.05), but ES lambs had higher feed intake and poorer feed conversion than NS lambs (P  0.05) but improved ADG by 14.2% between days 21 and 40 (P 
ISSN:0008-3984
1918-1825
DOI:10.4141/cjas90-093