Evaluation of feed conversion efficiency for different dairy cows breeds by milk yield, milk content and faecal amount
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Kuupäev
2020
Kättesaadavus
Autorid
Ajakirja pealkiri
Ajakirja ISSN
Köite pealkiri
Kirjastaja
Abstrakt
The objective of this study was to evaluation of feed conversion efficiency for Latvian
Brown (LB) and Holstein Black and White (HM) dairy cows breeds to define optimal crude
protein (CP) content in the feed. In the research study were completed three (A, B, C) dairy cows
group (8 cows in each group) with LB and HM breed’s cows in the early lactation period, from
10 till 30 lactation days. Each groups cows were feeder with total mixed ration (TMR) with
different CP content (approx. 18.0%, 17.5%, 17.0% accordingly). In the research period were
controlled the amount of feed fed and regularly collected feed samples. After 21 days feeding
was controlled milk yield, collected milk samples for content testing, and faecal amount and
samples. Milk samples were analysed for fat, total protein (%) and urea content (mg dL-1
). Milk
samples for content parameters were analysed in an accredited milk quality laboratory. The
statistical analyses were performed with the SPSS program package. The results acquired show
that in all studied parameters were not significant differences between study groups. To evaluate
the feed conversion efficiency during the study, we used the energy corrected milk (ECM) and
the feed dry matter content during research and calculated the coefficient for each cow individually
and on average in the study group. Milk yield, protein and faecal amount were significantly
different among breeds. Milk urea content was average 28.5 mg dL-1
for all LB breed cows in all
groups, for HM breeds it was 23.6 mg dL-1
. These results show that LB breed cows did not
converse feed proteins wholesome. Total milk and faecal amount were decreased in a group with
CP 17% in feed by 10% and 7% accordingly. By using this data, the farmer may make evaluations
and forecast of farming efficiency; cows breed preference and environmental threats.
Kirjeldus
Märksõnad
milk yield, milk urea, faecal, protein in feed, articles