Efecto del aporte de ensilaje de sorgo a la dieta de vaquillonas que pastorean verdeo de trigo

The objetive of this study was to evaluate the association between wheat pasture (WP) and sorghum silage (SS), from a nutritional and production viewpoint, to optimize the use of both resources. Three experiments were performed: I. Consumption, digestibility of DM, N and use of forage fiber; II. Mas...

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Autor principal: Coria, María Lucía
Otros Autores: Laborde, Hugo
Formato: tesis doctoral
Lenguaje:Español
Publicado: 2010
Materias:
wheat pasture
sorghum silage
stocking rate
intake
N balance
balance de N.
consumo
carga animal
verdeo de trigo
ensilaje de sorgo
Acceso en línea:http://repositoriodigital.uns.edu.ar/handle/123456789/2097
Aporte de:
Repositorio Institucional Universidad Nacional del Sur (UNS) de Universidad Nacional del Sur
id I20-R126123456789-2097
record_format dspace
institution Universidad Nacional del Sur
institution_str I-20
repository_str R-126
collection Repositorio Institucional Universidad Nacional del Sur (UNS)
language Español
orig_language_str_mv spa
topic wheat pasture
sorghum silage
stocking rate
intake
N balance
balance de N.
consumo
carga animal
verdeo de trigo
ensilaje de sorgo
spellingShingle wheat pasture
sorghum silage
stocking rate
intake
N balance
balance de N.
consumo
carga animal
verdeo de trigo
ensilaje de sorgo
Coria, María Lucía
Efecto del aporte de ensilaje de sorgo a la dieta de vaquillonas que pastorean verdeo de trigo
topic_facet wheat pasture
sorghum silage
stocking rate
intake
N balance
balance de N.
consumo
carga animal
verdeo de trigo
ensilaje de sorgo
description The objetive of this study was to evaluate the association between wheat pasture (WP) and sorghum silage (SS), from a nutritional and production viewpoint, to optimize the use of both resources. Three experiments were performed: I. Consumption, digestibility of DM, N and use of forage fiber; II. Mass of WP, weight and growth performance: average daily gain (ADG) and beef production/ha and, III. Estimation of voluntary intake by an external marker, LIPE. WP nutritional quality, %: June: 25.6, 18.1, 18.0, 88.9, 36.2, 15.6, July: 38.4, 18.2 , 17.1, 88, 8; 36, 3, 15.7, August 8: 45.6, 14.0, 16.6, 78.9, 42.1, 19 7, August 24: 41.7, 16.7, 14.7, 73.2, 52.4, 21.0, September: 25 0, 18.6, 9.7, 71.4, 60.0 and 26.5 for dry matter (DM), crude protein (CP), non-structural carbohydrates (CNES), in vitro DM digestibility (DMD), neutral detergent fiber (NDF) and acid detergent fiber (ADF), respectively. The values for the same quality parameters of SS were 30.4, 51.2, 7.8, 61.3, 35.3, 2.5, 18.9 and 1.9. In Experiment I, 24 lambs of 38+4.4 kg of body weight (BW) were placed in individual metabolism cages. The treatments were: WP ad libitum, SS ad libitum, 800WP (800g WP + SS), 600WP (600g WP + SS), 400WP (400g WP + SS) and 200WP (200g WP + SS). Total diet intake was determined by the difference between offered and rejected feed. Total fecal output (FO), as well as marker technique (LIPE) were used to estimate in vivo DMD. Other determinations included: NDF, ADF, IVDMD, NDF digestibility, ADF digestibility and balance of nitrogen (N). The Experiment II lasted 101 days (from 11/06 to 19/09, 2007). 60 heifers of 8 months of age and 200 +24.7 kg BW were used, which were distributed in six treatments in a factorial arrangement of two alternatives for availability (WP and WP + SS) and three intensities (A, M and B) with two replications. In Experiment III, 24 heifers were used. The treatments evaluated were the same as in Experiment II. SS intake was estimated by the difference between offered and rejected, and total intake of feed by an external marker, LIPE. The DMD was determined in vitro. In experiment I there was effect of diet (p <0.01) on NDF, IVDMD FDA, DIVFDA, N content in the diet, urine and N retained. Increasing WP allowances to SS basal diet showed no differences between them, nor against the pure diets, with the total DM intake in lambs. Animals that consumed WP, could replace up to 75% of this ingredient from SS, without to lower the consumption of MSD. Only in the ad libitum diet of WP N maintenance requirements of the lambs were covered, with negative balance in the other treatments. In experiment II there were differences (p <0.0001) between diets, and interaction D x I (p <0.05) for total C in WP and IVDMD. The total C was higher in WP without the addition of SS (A, M and B) for the three I with a substitution effect with depressed in consumption of WP in SS treatments. In experiment III, there were no significant differences for availability of WP between treatments (p = 0.9391 for D and p= 0.4171 for I), there was differences between dates sampling (DS) and interactions between I x DS and between I x DS x D. The average forage availability for WP was 800 kgDM/ ha. The ADG and AW differ significantly (p <0.0001) between weighing dates. The receptivity of WP increased by 83% (p ≤ 0.01) by the use of SS for AS and 69% for MS, the effect was not significant for BS (31%). There was variation in the relationship PB: CNES between diets with SS respect to the diets based only on WP, however AG of the heifers did not differ between treatments. The use of high grazing intensities of WP would not affect the ADG in heifers, which would increase the stocking rate or extend the grazing period of WP without affecting production. The enclosure for 20 h in SS and grazing WP for 4 h in growing heifers increases the receptivity of WP, may improve the stability of the productive results and thus increase the benefits of farms.
author2 Laborde, Hugo
author_facet Laborde, Hugo
Coria, María Lucía
format tesis doctoral
author Coria, María Lucía
author_sort Coria, María Lucía
title Efecto del aporte de ensilaje de sorgo a la dieta de vaquillonas que pastorean verdeo de trigo
title_short Efecto del aporte de ensilaje de sorgo a la dieta de vaquillonas que pastorean verdeo de trigo
title_full Efecto del aporte de ensilaje de sorgo a la dieta de vaquillonas que pastorean verdeo de trigo
title_fullStr Efecto del aporte de ensilaje de sorgo a la dieta de vaquillonas que pastorean verdeo de trigo
title_full_unstemmed Efecto del aporte de ensilaje de sorgo a la dieta de vaquillonas que pastorean verdeo de trigo
title_sort efecto del aporte de ensilaje de sorgo a la dieta de vaquillonas que pastorean verdeo de trigo
publishDate 2010
url http://repositoriodigital.uns.edu.ar/handle/123456789/2097
work_keys_str_mv AT coriamarialucia efectodelaportedeensilajedesorgoaladietadevaquillonasquepastoreanverdeodetrigo
bdutipo_str Repositorios
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