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Accueil du site → Doctorat → Royaume-Uni → 1993 → Voluntary intake and utilization of pea forage by sheep in the Mediterranean basin

Royal Veterinary College (University of London) 1993

Voluntary intake and utilization of pea forage by sheep in the Mediterranean basin

Carter, E.B

Titre : Voluntary intake and utilization of pea forage by sheep in the Mediterranean basin

Auteur : Carter, E.B

Université de soutenance : Royal Veterinary College (University of London)

Grade : Doctor of Philosophy (PhD) 1993

Résumé
Although the high yields and a good chemical composition make peas an excellent crop for inclusion in rainfed wheat-legume rotations in the Mediterranean region this potential is offset by low acceptance of the forage by sheep. Factors affecting voluntary feed intake (VFI) and subsequent digestion and utilization of pea forage harvested at different maturities were examined and compared with those of Vicia sativa (vetch), a taxonomically close relative which animals relish. These included : 1. Relative palatability (under choice grazing and rates of intake, ROI), taking account of plant genotype (20 pea genotypes), phenotype, chemistry, maturity and season (2 years), animal breed and species, and environment (Syria and Morocco). 2. Digestion, intra-ruminal degradation and rates of passage (ROP) of digesta solids of fresh immature herbage, hay and straw fed ad-libitum, and further studies under restricted feeding comparing fresh and field dried forage of the same maturity including monitoring of rumen pH and ammonia, blood urea and nitrogen and water balances. It was observed that : -Palatability was lower in pea than vetch for immature herbage and hay but not for straw. No differences between pea genotypes of similar maturity were observed although Syrian pea hay grown in Morocco was preferred to its locally grown counterpart. Acceptability did not differ between animal breed or species. -VFI and digestibility coefficients for peas more so than vetch, varied seasonally with changes in the growing environment. -Drying forages reduced digestibility of NDF and N, and increased N retention and rate of degradation. Rumen ammonia and blood urea levels fluctuated diurnally with inconsistent variability between diets. 3. The potential of legume straw as a supplement to cereal straw

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