Etude des quantités ingérées lors des grands repas chez des moutons recevant des fourrages ensilés

Dulphy, J.P.; Boissau, J.M.; Bousquet, H.; Jamot, Jacqueline; Jailler, Marie; L'hotelier, L.

doi:10.1051/animres:19850402

Cited by 2 publications

(2 citation statements)

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“…Moreover, fermentation products do not generally have highly attractive odours and tastes. Silage intake during the day corresponded to intake behaviour reported for silage-fed sheep, by Dulphy (1985) and Chiofalo et al (1992) and silage-fed steers (Thiago et al 1992b), i.e. one short principal meal after feed was offered, followed by a relatively high number of discrete meals throughout the day.…”

Section: Silagessupporting

confidence: 67%

“…Intake-regulating mechanisms seemed to have less effect over a daily period than over the short period of the principal meal (Dulphy, 1985), because the animals partly compensated for the smaller principal meal of WAS by an increased number of small meals during the day. With FAS + A the percentage of DMI during the small meals was equal to that of FAS.…”

Section: Silagesmentioning

confidence: 97%

See 1 more Smart Citation

The effect of protein degradation products in grass silages on feed intake and intake behaviour in sheep

Os¹,

Dulphy²,

Baumont³

1995

Br J Nutr

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The effects of NH, and amines on grass-silage intake, intake behaviour and rumen characteristics were studied in sheep. From a single sward, two direct-cut grass silages were prepared, either untreated (WAS) or with 4 5 1 formic acidltonne (FAS). Four experimental diets: WAS, FAS, FAS with addition of 2.9 g NH,bg DM (FAS+N) and FAS with 2-8 g aminesbg DM @AS+ A), were offered ad lib. once daily to four rumen-cannulated wethers in a 4 x 4 Latin square design. Daily DM intake (DMI) tended to be influenced by dietary treatment (P = 0.09). Compared with FAS, DMI was lower for WAS. Addition of NH, did not alter DMI, whereas amine addition slightly lowered daily DMI.Reduced DMI resulted from lower intake rates during both the principal meal and the subsequent small meals. Lower initial intake rate during the principal meal suggested reduced palatability of WAS and FAS+A. Amines and NH3, however, did not influence chewing efficiency. No treatment effects were observed on total rumen pool size, DM and neutral-detergent fibre content. Furthermore, NH, and amines did not alter rumen pH, NH, and volatile fatty acid concentrations to the extent that they could act on chemostatic intake regulation. Amine addition, however, lowered osmolality of the rumen liquid. No treatment effects on rumen motility were observed. In conclusion, daily DMI was not reduced by the addition of NH,, suggesting that NH,per se is not the causal factor in the negative correlations between silage NH, content and intake observed by other authors. Amines, however, tended to reduce DMI only by their effect at the oro-pharyngeal level of intake control.Silage: Feed intake: Ammonia: Amines: SheepThe generally lower voluntary intake of grass silages compared with hay prepared from the same fresh forage or with the fresh forage itself is mainly attributed to fermentation endproducts present in the silage. This reduction in intake varies widely (ranging from 0 to 64 %) and is related to the quantities of the fermentation products in the silage, which vary with the method of preservation (Demarquilly, 1973 ; Donaldson & Edwards, 1976; Thiago et al. 1992~). These fermentation products (organic acids, NH,, amines) may regulate intake by their oro-pharyngeal properties (taste, smell) or metabolically (metabolites in rumen and/or blood; Gill et al. 1987). Rumen fill appears to be of minor importance in controlling silage intake, because rumen DM content remains lower when the animals are fed on silages compared with hays prepared from the same original herbage (Thiago & Gill, 1986;Chiofalo et al. 1992). Relationships between silage constituents and intake suggest that NH, is one of the factors responsible for reduction in intake of poor-quality silages

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Section: Silagessupporting

confidence: 67%

Section: Silagesmentioning

confidence: 97%