Fecha/hora: 09/06/2024 16:59:05

Biblioteca(s): 	INIA Las Brujas; INIA Tacuarembó.	
Tipo de la producción científica: 	Artículos en Revistas Indexadas Internacionales	
Circulación/Nivel: 	Internacional - --	
Fecha corriente: 	15/10/2014	
Fecha de la última actualización: 	12/05/2020	
Autoria: 	MONTOSSI, F.; HODGSON, J.; MORRIS, S.T.	
Afiliación: 	FABIO MARCELO MONTOSSI PORCHILE, Instituto Nacional de Investigación Agropecuaria (INIA), Uruguay.	
Título: 	Herbage intake, ingestive behaviour and diet selection, and effects of condensed tannins upon body and wool growth in lambs grazing Lolium perenne and Holcus lanatus swards in summer.	
Año de publicación: 	1997	
Fuente/Imprenta: 	New Zealand Journal of Agricultural Research, 1997, v.40, no.4, p.449-461. FREE ACCESS	
ISSN: 	0028-8233	
DOI: 	10.1080/00288233.1997.9513267	
Idioma: 	Inglés	
Notas: 	Article history:  Received 14 Nov 1996 // Accepted 11 Aug 1997 // Published online: 17 Mar 2010.	
Contenido: 	ABSTRACT.

A comparative study was undertaken in New Zealand to investigate the effects of low concentrations of condensed tannins (CT) on diet selection, herbage intake, and performance in lambs grazing on four 0.2 ha paddocks each of perennial ryegrass (Lolium perenne) or Yorkshire fog (Holcus lanatus) with less than 10% white clover (Trifolium repens), continuously grazed at a constant height of approximately 6 cm from December 1992 to March 1993. The effects of CT on rumen metabolism and animal production were assessed by twice daily oral administration of polyethylene glycol (PEG; MW 4000) to half of the lambs on each sward. Bite weight was greater for Yorkshire fog swards than for ryegrass swards during January (111 vs 85 ± 5 mg OM/bite, P &lt; 0.01), but not in December. In both December and January, grazing, ruminating, and idling times were similar between swards, while in January, the rate of biting in ryegrass swards was higher than in Yorkshire fog swards (64 vs 61 ± 1 bites/min, P &lt; 0.05). The organic matter digestibility (OMD) of the herbage selected was higher in ryegrass swards in December (81 vs 78 ± 0.04 %, P &lt; 0.01), but not in January (80 vs 79 ± 0.05 %). The herbage intake achieved by lambs grazing ryegrass swards was 23% higher than that achieved on Yorkshire fog swards in December (990 vs 800 ± 36 g OM/lamb/day, P &lt; 0.05) whereas, in January, herbage intakes did not differ significantly. Lambs grazing on ryegrass swards had higher clean wool growth (1147 vs 1085 ± 15 &#956;g/cm2 per day, P &lt; 0.10) and carcass weight (17.5 vs 16.3 ± 0.22 kg, P &lt; 0.05) than lambs grazing on Yorkshire fog swards. The stocking rate maintained on ryegrass plots was 25% greater than on Yorkshire fog plots. Low concentrations of CT were recorded in the diets of sheep on ryegrass and Yorkshire fog swards (&#8804; 0.2% on a DM basis). The low levels of CT had no significant effects on diet selection, herbage intake, grazing behaviour patterns, or lamb performance. However, the lambs grazing on Yorkshire fog swards showed small and nonpersistent responses to CT in terms of wool growth and liveweight gain. The results of this study indicate that: (i) under high fertility conditions and intensive management, perennial ryegrass/white clover swards appear to have higher feeding value than Yorkshire fog/white clover swards for lamb production and (ii) the low CT concentrations (&#8804; 0.2% in the DM) observed in both swards did not influence lamb performance significantly.	
Thesagro: 	ALIMENTACION DE LOS ANIMALES; CORDERO; DIETA ANIMAL; HOLCUS LANATUS.	
Categoría del tema: 	L02 Alimentación animal	
URL: 	http://www.ainfo.inia.uy/digital/bitstream/item/3543/1/Montossi-F.-1997.-New-Zeal.Jr.Agr.Res.-v.404-p.449-461.pdf	
Registro original: 	INIA Las Brujas (LB)	
Ejemplares: 	LB - (100189-1) - PXI - AP - DD - PP/NEW ZEALAND JR.AGR.RES./1997 -  -  - DIS
TBO - (103199-1) - PXI - AP - DD - PP/NEW ZEALAND JR.AGR.RES./1997 -  -  - DIS