Valor nutritivo do glicerol e comportamento ingestivo de vacas leiteiras periparturientes
Carregando...
Data
2010-12-06
Autores
Título da Revista
ISSN da Revista
Título de Volume
Editor
Universidade Federal de Goiás
Resumo
The expansion of the biofuel industry has generated increased
availability of glycerol, which can be used as an ingredient in the ration of
dairy cows. This study aimed to determine the effects of glycerol on
DMI, milk production, production of SCFA in the rumen, blood parameters,
selective consumption and feeding behavior of dairy cows periparturientes.
Twenty-six multiparous Holstein cows were paired according to
performance in the previous lactation and expected date of calving and fed
diets containing glycerol or high moisture corn from -28 to +56 DRDP. Glycerol
was included in 11.5 and 10.8% of total DM in the diet pre-and post-partum
respectively. CMS has not changed (P> 0.05) by feeding with glycerol
both pre-partum (14.9 vs. 14.6 kg / day, vs control. glycerol) and the post-partum
(19.8 vs. 20.7 kg / day, vs control. Glycerol), as well as production (35.8 vs. 37
kg / day, vs control. glycerol) and milk composition did not differ (P> 0.05) between
treatments. The concentration of blood glucose was reduced (P <0.05, vs 59.1.
53.4 mg / dL vs control. glycerol) and ABHB blood was elevated (P <0.05, 0.58
vs. 0.82 mmol / L vs control. glycerol) in cows fed glycerol during
pre-partum. The concentration of NEFA in the blood did not differ (P> 0.05) between
experimental groups in the pre-partum, and no effect (P> 0.05) on the glycerol
blood parameters during the postpartum period. The total concentration of SCFA in
rumen (mmol / L) did not differ (P> 0.05) between treatments, but increased
(P <0.05) in the molar proportion of propionate (22.7 vs. 28.6% vs control. Glycerol)
and butyrate (11.5 vs. 15.3% vs control. glycerol) and reduced (P <0.05) in proportion
molar acetate (61.5 vs. 51.5% vs control. glycerol) in cows fed
with glycerol. In relation to the selective consumption and ingestive behavior, there
increase (P <0.05) the rate of DMI (94.2 vs. MS 144.4 g / h vs. control. glycerol) and
preferential consumption (9.2 vs. 17.8% vs control. glycerol) long particle
with glycerol in the diet, but decreased (P <0.05) the rate of CMS
short particles (383.8 vs. MS 332.5 g / h vs. control. glycerol) and very short
(173.9 vs. MS 129.8 g / h vs. control. Glycerol) and increased (P <0.05) in rejecting
short particles (42 vs. 37.3% vs control. glycerol) and very short (17.9 vs.
13.6% vs control. glycerol) during pre-partum. No effect (P> 0.05) of
treatments on the selective use of particles of the diet in the postpartum period and also on the feeding behavior throughout the experimental period.
The data obtained in this study indicated that replacing corn
wet grain by glycerol in diets for dairy cows was periparturientes
satisfactory.
Descrição
Citação
CARVALHO, Eduardo Rodrigues de. Nutritional value of glycerol and ingestive behavior of dairy cows periparturientes. 2010. 107 f. Tese (Doutorado em Ciências Agrárias) - Universidade Federal de Goiás, Goiânia, 2010.