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Voluntary intake, digestibility and nitrogen utilization by sheep fed ensiled grass clover mixture harvested at three stages of maturity

Marina Vranić ; Agronomski fakultet Sveučilišta u Zagrebu, Zagreb, Hrvatska
Mladen Knežević
Krešimir Bošnjak
Goran Perčulija
Hrvoje Kutnjak


Puni tekst: hrvatski pdf 605 Kb

str. 357-369

preuzimanja: 693

citiraj


Sažetak

The objective of this experiment was to study the effects of grass maturity at harvest on silage ad libitum intake, in vivo digestibility and N retention in wether sheep. The sward was harvested at the stem elongation, tasseling and flowering growth stages of orchardgrass (Dactylis glomerata). Three silages were offered to four Charolais wether sheep in an incomplete change over design with four periods. As the crop matured, there was an increase (P<0.001) in dry matter (DM), organic matter (OM) and acid detergent fiber (ADF) concentration and a decrease in crude protein (CP) concentration (P<0.001). Increasing maturity of grass ensiled showed a linear decrease (P<0.01) in voluntary silage intake of DM, OM, neutral detergent fiber (NDF), a linear decrease (P<0.01) in digestibility of silage DM, OM, NDF, ADF, CP, and a linear decrease in nitrogen balance (P<0.01). No quadratic response was recorded in silage intake, digestibility or N balance. The results suggest that grass maturity at harvest influences the nutritive value of grass silage, in terms of ad libitum intake, in vivo digestibility and N retention in sheep, as a result of changes in chemical composition.

Ključne riječi

forage production, grass-clover silage, maturity stage, ad libitum intake, N balance

Hrčak ID:

30637

URI

https://hrcak.srce.hr/30637

Podaci na drugim jezicima: hrvatski

Posjeta: 1.497 *