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Titolo:
Effects of maize and citrus-pulp supplementation of urea-treated wheat straw on intake and productivity in female lambs
Autore:
Fonseca, AJM; Dias-da-Silva, AA; Lourenco, ALG;
Indirizzi:
Univ Tras Os Montes & Alto Douro, Dept Anim Prod, ICETA, P-5001 Vila Real,Portugal Univ Tras Os Montes & Alto Douro Vila Real Portugal P-5001 Real,Portugal
Titolo Testata:
ANIMAL SCIENCE
, volume: 73, anno: 2001,
parte:, 1
pagine: 123 - 136
SICI:
1357-7298(200108)73:<123:EOMACS>2.0.ZU;2-C
Fonte:
ISI
Lingua:
ENG
Soggetto:
PURINE DERIVATIVE EXCRETION; BARLEY STRAW; PROTEIN DEGRADABILITY; AMMONIA TREATMENT; LIVE-WEIGHT; RICH DIETS; DRY-MATTER; SHEEP; DIGESTION; RUMEN;
Keywords:
energy intake; food intake; sheep; straw;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
52
Recensione:
Indirizzi per estratti:
Indirizzo: Fonseca, AJM Univ Porto, Inst Ciencias Biomed Abel Salazar, Campus Agr Vairao,Rua Monte, P-4485661 Vairao, Portugal Univ Porto Campus Agr Vairao,Rua Monte Vairao Portugal P-4485661
Citazione:
A.J.M. Fonseca et al., "Effects of maize and citrus-pulp supplementation of urea-treated wheat straw on intake and productivity in female lambs", ANIM SCI, 73, 2001, pp. 123-136

Abstract

Two experiments with lambs given food indoors and individually penned weredesigned to study the effects of different levels of ground maize and citrus pulp as supplements of a diet based on urea-treated straw (5 kg urea per100 kg straw) offered ad libitum over a period of 16 weeks (experiment 1) or 10 weeks (experiment 2). The voluntary intake, live-weight gain (LWG), organic matter digestibility (DMD), urinary allantoin-nitrogen (UAN) excretion and acetate clearance rate were measured. The lambs were blocked on weight and randomly assigned to the treatments described below. Ruminal outflowrate of the solid and liquid phases from the rumen were also measured in experiment 2. In experiment 1, 20 female lambs from the Ile-de-France breed, with an initial live weight (LW) of 43 (s.e. 3.3) kg were used. Wheat straw (WS) was supplemented with 50 g/kg of fish meal (FM) and with 0, 100, 200 or 300 g/kgof ground maize on a dry-matter (DM) basis (M0, M1, M2 and M3, respectively). In experiment 2, 25 female lambs from the Portuguese breed Churra-da-Terra-Quente, with an initial LW of 24.2 (s.e. 4.3) kg were used. The straw was offered ad libitum during 10 weeks and supplemented with 50 g/kg of FM and 0, 100, 200, 300, or 400 g/kg of dried citrus pulp on a DM basis (CP0, CP1, CP2, CP3 and CP4, respectively). During the experiments, all animals were moved to metabolism cages to measure DMD and UAN excretion. Two additional incubation studies were carried out with rumen fistulated rams (experiment 1) or cows (experiment 2) given the diets described above close to the maintenance feeding level. In experiment 1 daily straw DM intake linearly decreased (P < 0.05) from 21.6 to 17.7 g/kg LW and LWG linearly increased (P < 0.05) from 51 to 154 g/day for treatments M0, M1, M2 and M3, respectively. The rate of straw DM degradation was significantly decreased (P < 0.01) by maize supplementation. Straw DMD (kg/kg) was 0.562, 0.583, 0.547 and 0.520 and UAN (mg/day) was 620, 790, 854 and 859 for treatments MO, M1, M2 and M3, respectively. Acetateclearance rate, increased (P < 0.05) as the level of maize inclusion increased. In experiment 2 daily straw DM intake was 23.3, 25.8, 24.7, 23.5 and 18.6 g/kg LW per day and LWG was -9, 28, 44, 64 and 67 g/day for treatments CP0,CP1, CP2, CP3 and CP4, respectively. Supplementation significantly increased LWG (P <less than> 0.001) but at the 400 g/kg level depressed straw DM intake. Straw DMD linearly decreased (P < 0.05) from 0.484 (CPD) to 0.428 (CP4) g/kg and UAN (mg/day) was 181, 303, 363, 384 and 392 for treatments CPO, CP1, CP2, CP3 and CP4, respectively. Rumen outflow rate of fibre particles was unaffected by supplementation while the outflow of liquid phase tended to be increased (P < 0.10). The rate of DM degradation was significantly reduced (P < 0.01) by citrus-pulp inclusion. Acetate clearance rate was unaffected (P <greater than> 0.05) by citrus-pulp supplementation. The results of these experiments demonstrate that supplementation of urea-treated straw with ground maize up to 200 g/kg or with citrus pulp up to 300 g/kg of the diet DM increased or did not depress straw intake, increased the supply of microbial protein and have no significant effect on straw digestibility. The efficiency of utilization of absorbed energy was apparentlyimproved by maize but not by citrus-pulp supplementation.

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Documento generato il 06/04/20 alle ore 01:42:39