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Forage feeding in intensive lamb production

intake and performance in ewes and lambs

Helander, Carl (2014). Forage feeding in intensive lamb production. Diss. (sammanfattning/summary) Skara : Sveriges lantbruksuniv., Acta Universitatis agriculturae Sueciae, 1652-6880 ; 2014:37
ISBN 978-91-576-8022-8
eISBN 978-91-576-8023-5
[Doctoral thesis]

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Abstract

Successful feeding strategies of periparturient ewes and growing lambs are essential in intensive indoor lamb production. This thesis evaluated the effects of chopping grass silage and of mixing silage with concentrate on feed intake, dietary selection, chewing behaviour, faecal particle size and performance in pregnant and lactating ewes and in suckling and finishing lambs. In addition, the effects of silage digestibility on feed intake, dietary selection and performance in pregnant and lactating ewes and in suckling lambs were evaluated. Lastly, the effects of feeding whole crop maize silage, harvested at different maturity stages, as the sole forage or combined with grass silage on feed intake, dietary selection, chewing behaviour, faecal particle size and performance in finishing lambs were evaluated.

Three experiments were conducted at Götala Beef and Lamb Research Centre, SLU, Sweden. The results show that by chopping grass silage prior to feeding pregnant and lactating ewes, eating time and dietary selection were decreased whereas rumination time was increased. Chopping of silage also increased growth rate of finishing lambs. Mixing of silage and concentrate increased feed intake in lactating ewes and growth rate of suckling lambs, indicating a higher milk yield of the ewes. Furthermore, improved digestibility of grass silage, due to earlier harvest, increased silage intake and body weight in pregnant and lactating ewes and reduced loss of body condition in lactating ewes. Early harvested silage also decreased concentrate intake and increased the growth rate of the suckling lambs, indicating a higher milk production of the ewes. To optimize feed efficiency, silage of maize harvested at dent stage of maturity should be fed as the only forage, whereas maize harvested at the dough stage could be fed in a mix with grass silage. Feeding maize silage as the sole forage decreased eating and rumination time per unit of intake. Lambs selected particles between 1 and 8 mm and sorted against particles high in fibre. Furthermore, to maximize lamb growth rate, the protein content and quality seem to be the most important dietary factors.

In summary, to maximize production output in intensive lamb production by optimizing feeding, highly digestible chopped grass silage or maize silage harvested at dent stage of maturity should be fed mixed with concentrate.

Authors/Creators:Helander, Carl
Title:Forage feeding in intensive lamb production
Subtitle:intake and performance in ewes and lambs
Series/Journal:Acta Universitatis agriculturae Sueciae (1652-6880)
Year of publishing :2014
Volume:2014:37
Number of Pages:73
Papers/manuscripts:
NumberReferences
I.Helander, C., Nørgaard, P., Arnesson, A. & Nadeau, E. (2014). Effects of chopping grass silage and of mixing silage with concentrate on feed intake and performance in pregnant and lactating ewes and in growing lambs. Small Ruminant Research 116(2-3), 78-87.
II.Helander, C., Nørgaard, P., Jalali, A.R. & Nadeau, E. (2014). Effects of chopping grass silage and mixing silage with concentrate on feed intake, chewing activity and faecal particle size of ewes in late pregnancy and early lactation. Livestock Science 163, 78-87.
III.Nadeau, E., Helander, C. & Arnesson, A. Grass maturity at harvest affects silage intake and performance of pregnant and lactating ewes and their suckling lambs. (manuscript).
IV.Helander, C., Nørgaard, P., Zaralis, K., Martinsson, K., Murphy, M. & Nadeau, E. Effects of maize crop maturity at harvest and dietary inclusion rate of maize silage on feed intake and performance of lambs fed highconcentrate diets. (submitted to Livestock Science).
V.Helander, C., Nørgaard, P., Zaralis, K. & Nadeau, E. Maturity stage of maize at harvest and inclusion of grass silage affect feed intake, dietary selection, chewing behaviour and faecal particle size in lambs. (manuscript).
Place of Publication:Skara
Publisher:Dept. of Animal Environment and Health, Swedish University of Agricultural Sciences
ISBN for printed version:978-91-576-8022-8
ISBN for electronic version:978-91-576-8023-5
ISSN:1652-6880
Language:English
Publication Type:Doctoral thesis
Full Text Status:Public
Agris subject categories.:L Animal production > L02 Animal feeding
L Animal production > L51 Animal physiology - Nutrition
Q Food science > Q54 Feed composition
Subjects:(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Agricultural Science
(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 402 Animal and Dairy Science > Animal and Dairy Science.
Agrovoc terms:lambs, ewes, feed intake, feeds, silage, chopping, harvesting date, faeces, animal feeding, growth
Keywords:chopping, eating, faecal particles, grass silage, lamb growth, maize silage, rumination, sheep, silage digestibility, total mixed ration
URN:NBN:urn:nbn:se:slu:epsilon-e-1912
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-e-1912
ID Code:11198
Faculty:VH - Faculty of Veterinary Medicine and Animal Science
Department:(VH) > Dept. of Animal Environment and Health
Deposited By: Carl Helander
Deposited On:20 May 2014 11:16
Metadata Last Modified:02 Dec 2014 11:06

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