The silage composition and its influence on dairy cows milk yield
2015
Petrovska, S., Latvia Univ. of Agriculture, Jelgava (Latvia). Inst. of Agrobiotechnology | Jonkus, D., Latvia Univ. of Agriculture, Jelgava (Latvia). Inst. of Agrobiotechnology | Adamovics, A., Latvia Univ. of Agriculture, Jelgava (Latvia). Inst. of Agrobiotechnology
The purpose of the research was to analyze the composition of maize and grass silages and estimate influence of forage: concentrate ratio on milk yield in dairy cows. Data were collected in 2013 and 2014 and consist of 11 samples of maize silage and 15 samples of grass silage. Dry matter (DM) content was not significantly different between years within silage group. Dry matter content of maize silage was 317.2 ± 15.14 g kgE-1 in 2013 and 361.5 ± 20.61 g kgE-1 in 2014, whereas corresponding DM in grass silage was 303.8 ± 17.58 g kgE-1 and 361.5 ± 20.61 g kgE-1. Crude protein content of DM was significantly higher in grass silage than in maize silage and ranged from 123.9 ± 8.07 g kgE-1 to 137.5 ± 7.12 g kgE-1. Net energy for lactation (NEL) was significantly higher in maize silage than in grass silage and ranged from 6.5± 0.09 MJ kgE-1 to 6.6 ± 0.06 MJ kgE-1 of DM (P is less than 0.05). Neutral detergent fibre (NDF) and acid detergent fibre (ADF) content of DM was lower in maize silage than in grass silage. The range in NDF was from 444.1 ± 12.40 g kg-1 to 487.1± 17.79 g kg-1, whereas corresponding ADF ranged from 252.9 ± 7.76 g kg-1 to 254.4 ± 7.76 g kg-1. The relationship between NEL and DM content was: NEL=0.0007×DM + 6.3317. Highest forage: concentrate dry matter ratio was 1.24 in May, 2013, whereas highest milk yield was observed in May, 2014.
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