Ad libitum Pasture Feeding in Late Pregnancy Does Not Improve the Performance of Twin-bearing Ewes and Their Lambs
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The present study evaluated the effect of controlled ryegrass-white clover herbage availability from day 128 until day 142 of pregnancy in comparison to unrestricted availability, on the performance of twin-bearing ewes of varying body condition score (BCS; 2.0, 2.5, or 3.0) and their lambs. It was hypothesised that under conditions of controlled herbage availability, the performance of lambs born to ewes with a greater BCS would be greater than those born to ewes with a lower BCS. During the period that the nutritional regimens were imposed, the pre- and post-grazing herbage masses of the Control regimen (1,070±69 and 801±30 kg dry matter [DM]/ha) were lower than the ad libitum regimen (1,784±69 and 1,333±33 kg DM/ha; p<0.05). The average herbage masses during lactation were 1,410±31 kg DM/ha. Nutritional regimen had no effect on ewe live weight, BCS and back fat depth or on lamb live weight, indices of colostrum uptake, maximal heat production, total litter weight weaned or survival to weaning (p>0.05). The difference in ewe BCSs and back fats observed among body condition groups was maintained throughout pregnancy (p<0.05). At weaning, ewes from the BCS2.0 group had lower BCS and live weight (2.4±0.2, 74.3±2.6 kg) than both the BCS2.5 (2.6±0.2, 78.6±2.4 kg) and BCS3.0 ewes (2.7±0.2, 79.0±2.6 kg; p<0.05), which did not differ (p>0.05). Ewe BCS group had no effect on lamb live weight at birth or weaning or on maximal heat production (p>0.05). Serum gamma glutamyl transferase concentrations of lambs born to BCS3.0 ewes were higher within 36 hours of birth than lambs born to BCS2.0 ewes and BCS2.5 ewes (51.8±1.9 vs 46.5±1.9 and 45.6±1.9 IU/mL, respectively [p<0.05]). There was, however, no effect of ewe body condition on lamb plasma glucose concentration (p>0.05). Lamb survival was the only lamb parameter that showed an interaction between ewe nutritional regimen and ewe BCS whereby survival of lambs born to BCS2.5 and BCS3.0 ewes differed but only within the Control nutritional regimen ewes (p<0.05). These results indicate farmers can provide twin-bearing ewes with pre- and post-grazing ryegrass-white clover herbage covers of approximately 1,100 and 800 kg DM/ha in late pregnancy, provided that herbage covers are 1400 in lactation, without affecting lamb performance to weaning. The present results also indicate that under these grazing conditions, there is little difference in ewe performance within the BCS range of 2.0 to 3.0 and therefore they do not need to be managed separately.
Abstract
The present study evaluated the effect of controlled ryegrass-white clover herbage availability from day 128 until day 142 of pregnancy in comparison to unrestricted availability, on the performance of twin-bearing ewes of varying body condition score (BCS; 2.0, 2.5, or 3.0) and their lambs. It was hypothesised that under conditions of controlled herbage availability, the performance of lambs born to ewes with a greater BCS would be greater than those born to ewes with a lower BCS. During the period that the nutritional regimens were imposed, the pre- and post-grazing herbage masses of the Control regimen (1,070±69 and 801±30 kg dry matter [DM]/ha) were lower than the ad libitum regimen (1,784±69 and 1,333±33 kg DM/ha; p<0.05). The average herbage masses during lactation were 1,410±31 kg DM/ha. Nutritional regimen had no effect on ewe live weight, BCS and back fat depth or on lamb live weight, indices of colostrum uptake, maximal heat production, total litter weight weaned or survival to weaning (p>0.05). The difference in ewe BCSs and back fats observed among body condition groups was maintained throughout pregnancy (p<0.05). At weaning, ewes from the BCS2.0 group had lower BCS and live weight (2.4±0.2, 74.3±2.6 kg) than both the BCS2.5 (2.6±0.2, 78.6±2.4 kg) and BCS3.0 ewes (2.7±0.2, 79.0±2.6 kg; p<0.05), which did not differ (p>0.05). Ewe BCS group had no effect on lamb live weight at birth or weaning or on maximal heat production (p>0.05). Serum gamma glutamyl transferase concentrations of lambs born to BCS3.0 ewes were higher within 36 hours of birth than lambs born to BCS2.0 ewes and BCS2.5 ewes (51.8±1.9 vs 46.5±1.9 and 45.6±1.9 IU/mL, respectively [p<0.05]). There was, however, no effect of ewe body condition on lamb plasma glucose concentration (p>0.05). Lamb survival was the only lamb parameter that showed an interaction between ewe nutritional regimen and ewe BCS whereby survival of lambs born to BCS2.5 and BCS3.0 ewes differed but only within the Control nutritional regimen ewes (p<0.05). These results indicate farmers can provide twin-bearing ewes with pre- and post-grazing ryegrass-white clover herbage covers of approximately 1,100 and 800 kg DM/ha in late pregnancy, provided that herbage covers are 1400 in lactation, without affecting lamb performance to weaning. The present results also indicate that under these grazing conditions, there is little difference in ewe performance within the BCS range of 2.0 to 3.0 and therefore they do not need to be managed separately.
참고문헌 (34)
- Alexander, G., "Temperature regulation in the new-born lamb. IV. The effect of wind and evaporation of water from the coat on metabolic rate and body temperature", Aust. J. Agric. Res, 13, pp.82~99 (1962)
- Aliyari, D., "Effect of body condition score, live weight and age on reproductive performance of Afshari ewes", Asian J. Anim. Vet. Adv, 7, pp.904~909 (2012)
- Al-Sabbagh, T. A., "The effect of ewe body condition at lambing on colostral immunoglobulin G concentration and lamb performance", J. Anim. Sci, 73, pp.2860~2864 (1995)
- Al-Sabbagh, T., "Colostral immunoglobulin as affected by nutritional status in Border Leicester Merino ewes deliver at Kuwait", Global Vet, 3, pp.281~285 (2009)
- Corner, R. A., "Effect of nutrition from mid to late pregnancy on the performance of twin- and triplet-bearing ewes and their lambs", Aust. J. Exp. Agric, 48, pp.666~671 (2008)
- Everts H., "Feeding strategy during pregnancy for ewes with a large litter size. 1. Effect of quantity and composition of concentrates on intake and reproductive performance", Netherlands. J. Agric. Sci, 38, pp.527~540 (1990)
- Everett-Hincks, J. M., "Management of maternal-offspring behavior to improve lamb survival in easy care sheep systems", J. Anim. Sci, 86, pp.259~270 (2009)
- Forbes, J. M., "The physical relationships of the abdominal organs in the pregnant ewe", J. Agric. Sci, 70, pp.171~177 (1968)
- Gibb, M. J., "The effect of ewe body condition at lambing on the performance of ewes and their lambs at pasture", J. Agric. Sci, 95, pp.631~640 (1980)
- Gibb, M. J., "The effect of body condition and nutrition during late pregnancy on the performance of grazing ewes during lactation", Anim. Prod, 34, pp.123~129 (1982)
- Hodgson, J., "New Zealand Pasture and crop science", pp.59~66 (1999), Oxford University Press
- Hossamo, H. E., "Body condition score and production in fat-tailed Awassi sheep under range conditions", Res. Dev. Agric, 3, pp.99~104 (1986)
- Jefferies, B. C., "Body condition scoring and its use in management", Tas. J. Agric, 32, pp.19~21 (1961)
- Kenyon, P. R., "Review of sheep body condition in relation to production characteristics", N.Z. J. Agric. Res, 57, pp.38~64 (2014)
- Kenyon, P. R., "The effects of body condition score and nutrition of triplet-bearing ewes in late pregnancy", Small Rumin. Res, 113, pp.154~161 (2013)
- Kenyon, P. R., "Effect of twin-bearing ewe body condition score and late pregnancy nutrition on lamb performance", Anim. Prod. Sci, 52, pp.483~490 (2012)
- Kenyon, P. R., "Nutritional restriction of triplet-bearing ewes and body condition score has minimal impacts", NZ. J. Agric. Res, 55, pp.359~370 (2012)
- Kenyon, P. R., "Effects of twin-bearing ewe nutritional treatments on ewe and lamb performance to weaning", Anim. Prod. Sci, 51, pp.406~415 (2011)
- Kerslake, J. I., "The effect of offering concentrate supplement to twin- and triplet-bearing ewes grazing a 60 mm herbage sward height on lamb birth weight, heat production and post-natal growth", J. Agric. Sci, 147, pp.613~624 (2009)
- Kerslake, J. I., "Can maternal iodine supplementation improve twin- and triplet-born lamb plasma thyroid hormone concentrations and thermoregulation capabilities in the first 24-36 h of life?", J. Agric. Sci, 148, pp.453~463 (2010)
- Kerslake, J. I., "The effect of offering concentrate supplement to twin- and triplet-bearing ewes grazing a 60 mm herbage sward height on lamb birth weight, heat production and post-natal growth", J. Agric. Sci, 147, pp.613~624 (2009)
- McCutcheon, S. N., "Resistance to cold stress in the newborn lamb 1. Responses of Romney, Drysdale × Romney, and Merino lambs to components of the thermal environment", NZ. J. Agric. Res, 26, pp.169~174 (1983)
- Maden, M., "Blood and colostrum", milk serum gamma-glutamyltransferase activity as a predictor of passive transfer status in lambs, 2003, pp.50, 128~131
- Matthews, P. N. P., "New Zealand pasture and crop science", pp.133~151 (2000), Oxford University Press
- Mellor, D. J., "Animal Models in Fetal Medicine VI", pp.55~92 (1987), Perinatology Press
- Morris, S. T., "The effect of litter size and sward height on ewe and lamb performance", NZ. J. Agric. Res, 47, pp.275~286 (2004)
- Morris, S. T., "Effect of sward height during late pregnancy on intake and performance of continuously stocked June- and August-lambing ewes", Aust. J. Agric. Res, 44, pp.1635~1651 (1993)
- Nicol, A. M., "Pasture and supplements for grazing animals", pp.151~172 (2007), New Zealand Society of Animal Production Hamilton
- Revell, D. K., "Shearing ewes at mid-pregnancy is associated with changes in fetal growth and development", Aust. J. Agric. Res, 53, pp.697~705 (2002)
- Rozeboom, K. J., "Relationships among ewe body condition scores, lamb vigour, colostral quality, milk composition and reproductive performance", J. Anim. Sci, 85(2), pp.138~ (2007)
- SAS Institute Inc., "SAS User's Guide: Version 9.3", SAS Institute Inc., ~ (2010)
- "Statistics New Zealand"[URL]
- Tessman, R. K., "Use of age and serum γ-glutamyltransferase activity to assess passive transfer status in lambs", J. Am. Vet. Med. Assoc, 211, pp.1163~1164 (1997)
- Thompson, A. N., "Improving the nutrition of Merino ewes during pregnancy and lactation increases weaning weight and survival of progeny but does not affect their mature size", Anim. Prod. Sci, 51, pp.784~793 (2011)