Use this URL to cite or link to this record in EThOS: https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.369033
Title: The effect of dietary protein source on the metabolism and performance of ewes in late pregnancy and early lactation
Author: Handford, David
ISNI:       0000 0001 3529 7914
Awarding Body: Open University
Current Institution: Open University
Date of Award: 2001
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Abstract:
Three experiments were carried out to investigate the effects of dietary protein source on the metabolism and performance of straw fed, twin-bearing ewes in late pregnancy and early lactation. In the first experiment, 72 ewes were fed concentrate diets which contained either fishmeal or formaldehyde treated soya-bean meal. The concentrate was either fed alone, or at a reduced rate with feedblocks ad libitum in a two by two factorial design. Ewes fed fishmeal lost more condition after parturition and had lambs which grew quicker than ewes fed treated soya-bean meal (P < 0.05). Ewes offered feedblocks produced colostrum with a higher immunoglobulin G (IgG) concentration at birth, had lambs with a higher litter weight than those fed concentrate alone (P < 0.05). In the second experiment, 60 ewes were fed concentrates containing either untreated or formaldehyde treated rapeseed meal or field beans in a two by two factorial design with an additional control diet containing fishmeal. Ewes fed fishmeal had a higherpre partum condition score gain and had lambs which grew slower with a lower litter weight at 28 days than ewes fed all other diets. Ewes fed rapeseed meal had a higher total colostrum yield at birth than ewes fed field beans (P < 0.05). Ewes fed formaldehyde treated protein sources had a reduced yield of total milk, protein, solids not fat and lactose at 21 days post partum than ewes fed untreated protein sources (P < 0.05). In the third experiment, 44 ewes were fed concentrate diets containing either fishmeal, untreated soya-bean meal, formaldehyde treated soya-bean meal or formaldehyde treated soya-bean meal with added rumen protected methionine. Ewes fed formaldehyde treated soya-bean meal with added methionine produced colostrum between 12 and 16 hours post partum with a higher fat concentration and a higher yield of fat and crude protein than ewes fed fishmeal (P < 0.05). Ewes fed formaldehyde treated soya-bean meal with added methionine had lambs which grew quicker and were heavier at 28 days of age than those fed fishmeal (P < 0.05).
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID: uk.bl.ethos.369033  DOI: Not available
Keywords: Ewe nutrition; Fishmeal; Protein digestion
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