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University of Reading (1993)

Sorghum stover and lablab bean haulm for dry-season feeding of lactating cattle in semi-arid central Tanzania

Kitalyi, Aichi Joseph

Titre : Sorghum stover and lablab bean haulm for dry-season feeding of lactating cattle in semi-arid central Tanzania.

Auteur : Kitalyi, Aichi Joseph

Université de soutenance : University of Reading

Grade : Doctor of Philosophy (Ph.D.) : 1993

Résumé
A dry-season survey in Mpwapwa, central Tanzania showed shortage of natural pastures to be the most limiting factor in milk production, and crop residues to be the only potential forage resource. Sorghum stover was the most abundant crop residue and lablab bean haulm appeared a potential legume forage for supplementing sorghum stover. The present study therefore investigated the yeild and nutritive value of sorghum stover and lablab bean haulm with particular reference to lactating Mpwapwa cattle. In Experiment 1, five local lablab bean ecotypes were evaluated for haulm dry matter [DM] yield and persistence in the dry season. A dark, brown-seeded, ex-Mpwapwa ecotype was highest yielding and was selected for subsequent experiments. Experiments 2 and 3, of 4-period change-over designs, involved offering lactating cows (live weight [M] &#61 334 kg) chopped sorghum stover at 30g DM/kg M.d with supplements of 0, 7 or 14 g DM lablab bean ahulm/kg M.d. Maize bran was offered at milking (0.4 kg D&#60M/kg milk). Mean milk yields were 7 kg/d. Experiment 3 showed a non-significant (P&#62 0.05) lablab haulm substition effect on stover DM intake (14.5, 14.3 and 13.4 g DM/kg M.d., s.e.d &#61 1.04, for the 0, 7 and 14 lablab haulm feeding levels). Cows selected for leaf in both the stover and haulm. Supplementation with haulm increased significantly (P&#60 0.001) the estimated intake of forage digestible organic matter (2.5, 3.4 and 4.3 kg/day at 0, 7 and 14 lablab haulm levels). There was no effect (P&#62 0.05) on milk yield. Experiments 35, 6, 7 and 8 were plot experiments which studied the effect of harvesting delays of 0, 2 or 4 months on quantity and quality of stover and haulm. DM yields ranged from 5 to 8 t DM/ha for stover and from 2 to 5 DM/ha for haulm. Delayed harvesting of sorghum stover for 2 months after grain harvesting had no adverse effects of yield or quality. Lablab bean haulm was affected most by delayed harvesting due to high leaf losses. High N content and high in vitro OM digestibility were observed in stover leaf (8 to 18 g N/kg DM and 555 and 644 g/kg OMD) and in lablab bean leaf (29 to 39 g N/kg DM and 600 to 671 g/kg OMD).

Annonce : EThOS (UK)

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