Influence of growth stage of forages on dry matter intake of silages in heifers
2013
Latal, O., Research Institute for Cattle Breeding, Vikyrovice (Czech Republic) | Pozdisek, J., Research Institute for Cattle Breeding, Vikyrovice (Czech Republic) | Stybnarova, M., Research Institute for Cattle Breeding, Vikyrovice (Czech Republic)
Tha aim of this article was assessment of voluntary dry matter intake (VI) of silages made from two perspective intergeneric grass hybrids Festulolium (Hykor and Perun) nad red clover var. Amos (4n). In the first crop year (2011) there were conducted harvest at two different dates: I (at the end of teh grass shooting growth stage) and II (with the time postponement by ca 14 days). The swards were fertilized in the spring with the dose of N60 + P35K100 (pure nutrients). The experriment was conducted on the 6 heifers (from the sucker cows rearing system) using loose box housing. VI was influenced by harvest date. Value of VI (P less than 0.05) was higher in I (24.02 g/kg BW, SE = 2.43) than in the II (18/.48 g/kg BW, SE = 2.56). By different harvest dates of forages inscribed as I and II, it was observed the weekly decrease of VDMI by 2.00 g/kg BW in clover and by 3.20 g/kg BW in grasses. The same tendencies we confirmed in NEL concentration, the value weakly decreased by 0.61 MJ/kg DM in grasses and by 0.56 MJ/kg DM in clover. On the other hand inscribed as I and II value of NDF content weekly increased by 69.3 g/kg DM in clover and 88,9 g/kg DM in grasses and zhe CF content increased by 53.7 g/kg DM in clover and by 70.1 g/kg DM in grasses. There was found the negative correlation between VI and NDF concentration (P less than 0.05), as well as the positive correlation between VI and NEL concentration (P less than 0.05).
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