A comparison of liveweight gain of lambs weaned early onto a herb-clover mixed sward and weaned conventionally onto a ryegrass-clover pasture and herb-clover mixed sward
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Objective: The aim of the present study was to identify the impact of early weaning of lambs at approximately seven weeks of age onto a herb-clover mix on the liveweight gain of lambs and their dams. Methods: In 2015, twin-born lambs that weighed a minimum of 16 kg (n = 134) were randomly allocated to one of three treatments: i) Early-weaned (58 days after the midpoint of lambing) onto an unrestricted allowance (>1,200 kg dry matter/ha) of herb-clover mix (HerbEW); ii) Lambs+dams unweaned onto an unrestricted allowance of herb-clover mix until conventional weaning (95 days after the midpoint of lambing) (HerbCW); iii) Lambs+ dams unweaned onto an unrestricted allowance of grass-clover pasture until conventional weaning (GrassCW). In 2016, twin-born lambs that weighed a minimum of 16 kg (n = 170) were randomly allocated to one of four treatments: i), ii), iii) (similar to 2015) and iv) Lambs+ dams unweaned onto a restricted allowance (<1,200 kg dry matter/ha) of grass-clover pasture until conventional weaning (93 days after the midpoint of lambing) (Restricted-GrassCW). Results: In 2015, liveweight gain from L58 to L95 of HerbCW and GrassCW lambs did not differ (p>0.05), but were greater than HerbEW lambs. In 2016, HerbCW lambs had greater (p<0.05) liveweight gains from L51 to L93 than GrassCW followed by HerbEW and Restricted-GrassCW lambs. In 2015, liveweight gain from L58 to L95 of HerbEW ewes were greater than both GrassCW and HerbCW ewes while in 2016, liveweight gain of from L51 to L93 GrassCW and HerbCW ewes did not differ (p>0.05) but were greater (p<0.05) than those of HerbEW and Restricted-GrassCW ewes. Conclusion: These results indicate that when grass-clover pasture supply can be maintained at unrestricted intake level, there may be no benefit of weaning lambs early. However, at restricted pasture conditions lambs can achieve greater liveweight gains when weaned early onto a herb-clover mix.
Abstract
Objective: The aim of the present study was to identify the impact of early weaning of lambs at approximately seven weeks of age onto a herb-clover mix on the liveweight gain of lambs and their dams. Methods: In 2015, twin-born lambs that weighed a minimum of 16 kg (n = 134) were randomly allocated to one of three treatments: i) Early-weaned (58 days after the midpoint of lambing) onto an unrestricted allowance (>1,200 kg dry matter/ha) of herb-clover mix (HerbEW); ii) Lambs+dams unweaned onto an unrestricted allowance of herb-clover mix until conventional weaning (95 days after the midpoint of lambing) (HerbCW); iii) Lambs+ dams unweaned onto an unrestricted allowance of grass-clover pasture until conventional weaning (GrassCW). In 2016, twin-born lambs that weighed a minimum of 16 kg (n = 170) were randomly allocated to one of four treatments: i), ii), iii) (similar to 2015) and iv) Lambs+ dams unweaned onto a restricted allowance (<1,200 kg dry matter/ha) of grass-clover pasture until conventional weaning (93 days after the midpoint of lambing) (Restricted-GrassCW). Results: In 2015, liveweight gain from L58 to L95 of HerbCW and GrassCW lambs did not differ (p>0.05), but were greater than HerbEW lambs. In 2016, HerbCW lambs had greater (p<0.05) liveweight gains from L51 to L93 than GrassCW followed by HerbEW and Restricted-GrassCW lambs. In 2015, liveweight gain from L58 to L95 of HerbEW ewes were greater than both GrassCW and HerbCW ewes while in 2016, liveweight gain of from L51 to L93 GrassCW and HerbCW ewes did not differ (p>0.05) but were greater (p<0.05) than those of HerbEW and Restricted-GrassCW ewes. Conclusion: These results indicate that when grass-clover pasture supply can be maintained at unrestricted intake level, there may be no benefit of weaning lambs early. However, at restricted pasture conditions lambs can achieve greater liveweight gains when weaned early onto a herb-clover mix.
참고문헌 (26)
- Somasiri SC, "Effect of herb-clover mixes on weaned lamb growth", PhD, pp.2014
- Navarrete S, "Effect of grazing frequency by dairy cows on herb based pastures", Proceedings XXII International Grassland Congress, pp.1173~1174 (2013)
- Cranston LM, "A review of the use of chicory, plantain, red clover and white clover in a sward mix for increased sheep and beef production", J NZ Grassl, 77, pp.89~94 (2015)
- Somasiri SC, "Herb-clover mixes increase lamb live weight gains and carcass weight in the autumn period", NZ J Agric Res, 58, pp.384~396 (2015)
- Somasiri SC, "Effect of herb-clover mixes of plantain and chicory on yearling lamb production in the early spring period", Anim Prod Sci, 56, pp.1662~1668 (2018)
- Kenyon PR, "Can a herb and white clover mix improve the performance of multiple bearing ewes and their lambs to weaning?", Anim Prod Sci, 50, pp.513~521 (2010)
- Golding KP, "High weaned lamb live weight gains on herbs", Agron NZ, 38, pp.33~39 (2008)
- Hutton PG, "A herb and legume sward mix increased ewe milk production and ewe and lamb live weight gain to weaning compared to a ryegrass dominant sward", Anim Feed Sci Technol, 164, pp.1~7 (2011)
- Corner-Thomas RA, "Grazing alternative herbages in lactation increases the liveweight of both ewe lambs and their progeny at weaning", Anim Prod Sci, 54, pp.1741~1746 (2014)
- Geenty K, "International Sheep and Wool Handbook", pp.259~276 (2010), University Press
- Kenyon PR, "Pasture and supplements for grazing animals", pp.255~274 (2007), NZ Soc Anim Prod
- Baars A, "Climate change effects on seasonal patterns of pasture production in New Zealand", Proc NZ Grassl Assoc, 51, pp.43~46 (1990)
- Coop IE, "Feeding, growth and health", pp.137~162 (1986), Ray Richards Publishers
- Morris ST, "The effect of litter size and sward height on ewe and lamb performance", NZ J Agric Res, 47, pp.275~286 (2004)
- Nowak R, "From birth to colostrum : early steps leading to lamb survival", Reprod Nutr Dev, 46, pp.431~446 (2006)
- Frame J, "Sward measurement handbook", pp.39~69 (1993), British Grassland Society
- Roughan P, "Predicting in-vivo digestibility of herbages by exhaustive enzymic hydrolysis of cell walls", J Sci Food Agric, 28, pp.1057~1064 (1977)
- AOAC, "Official methods of analysis of the AOAC International" (2007), AOAC International
- Robertson J, "The analysis of dietary fiber in food", pp.123~158 (1981), Marcel Dekker Inc
- Peart JN, "The influence of live weight and body condition on the subsequent milk production of Blackface ewes following a period of undernourishment in early lactation", J Agric Sci, 75, pp.459~469 (1970)
- Cannas A, "Dairy sheep nutrition", pp.151~164 (2004), CAB International
- Muir PD, "Maximizing lamb growth rates", Proc NZ Grassl Assoc, 62, pp.55~58 (2000)
- Golding KP, "Mixed herb and legume pasture improves the growth of lambs post-weaning", Anim Prod Sci, 51, pp.717~723 (2011)
- Pain SJ, "Preference of lambs for novel pasture herbs", Proc NZ Soc Anim Prod, 70, pp.285~287 (2010)
- Rutter SM, "Diet preference for grass and legumes in free-ranging domestic sheep and cattle : current theory and future application", Appl Anim Behav Sci, 97, pp.17~35 (2006)
- Fraser TS, "Legumes, herbs or grass for lamb growth?", Proc NZ Grassl Assoc, 58, pp.49~52 (1996)