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Effect of condensed tannins in Lotus corniculatus upon lactation performance in ewes

Published online by Cambridge University Press:  27 March 2009

Y. Wang ,
G. B. Douglas ,
G. C. Waghorn ,
T. N. Barry  and
A. G. Foote
Y. Wang
Affiliation:
Department of Animal Science, Massey University, Palmerston North, New Zealand
G. B. Douglas
Affiliation:
Ag Research Grasslands, Palmerston North, New Zealand
G. C. Waghorn
Affiliation:
Ag Research Grasslands, Palmerston North, New Zealand
T. N. Barry
Affiliation:
Department of Animal Science, Massey University, Palmerston North, New Zealand
A. G. Foote
Affiliation:
Ag Research Grasslands, Palmerston North, New Zealand
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Summary

A grazing experiment was conducted for 8 weeks in the spring/summer of 1993 at Palmerston North, New Zealand, to study the effects of condensed tannins (CT) in Lotus corniculatus (birdsfoot trefoil cv. Grasslands Goldie) upon the lactation performance of ewes rearing twin lambs. Effects of CT were evaluated by studying the responses of ewes to twice daily oral supplementation with polyethylene glycol (PEG; MW 3500), which binds and inactivates CT. A rotational grazing system with restricted feed allowance was used. Measurements were made of pre- and post-grazing herbage mass, the composition of the feed on offer and diet selected, voluntary feed intake (VF1), milk yield and composition, liveweight gain and wool production. The concentration of metabolites in rumen fluid and in blood plasma was also measured. Lotus contained 35–5 g total nitrogen and 44–5 g total CT/kg dry matter in the diet selected, with an in vitro digestibility of 73%. At peak lactation (weeks 3 and 4) milk yield and composition were similar for control (CT-acting) and PEG-supplemented (CTinactivated) ewes but, as lactation progressed, the decline in milk production and in the secretion rates of protein and lactose were less for control than for PEG-supplemented ewes. In mid and late lactation (weeks 6–11), control ewes secreted more milk (21 %), more milk protein (14%) and more lactose (12%) than PEG-supplemented ewes. Milk fat percentage was lower for control than for PEG-supplemented ewes, but secretion rates of fat were similar for the two groups. VFI, liveweight gain and wool growth were similar for both groups. Plasma urea and glucose concentrations were lower for control than for PEG-supplemented ewes, but concentrations of non-esterified fatty acids (NEFA), growth hormone and insulin were similar for the two groups. The concentrations of ammonia and molar proportions of iso-butyric, iso-and n-valeric acids in rumen fluid were lower for control than for PEG-supplemented ewes; molar proportions of acetic, propionic and H-butyric acids were similar for the two groups. It was concluded that for ewes rearing twin lambs grazing L. corniculatus, the action of CT increased milk yield and the secretion rates of protein and lactose without affecting VFI, thereby increasing the efficiency of milk production. The increased milk production did not appear to be mediated by effects on plasma concentrations of growth hormone or insulin.

Type
Animals
Information
The Journal of Agricultural Science , Volume 126 , Issue 3 , May 1996 , pp. 353 - 362
Copyright
Copyright © Cambridge University Press 1996

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