Protected soyabean protein and the calcium salt of N-hydroxymethyl-DL-methionine in feeding high-yielding dairy cows. I. Feed intake and milk yield

Burgstaller, G.; Zywczok, H.; Mogalle, H.; Lindner, J.P.

Zuchtungskunde 55(4): 275-288


ISSN/ISBN: 0044-5401
Accession: 001240475

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In the 1st 14 weeks of lactation 24 high-yielding German Simmental X Red-and-White Holstein cows in 3 groups consumed daily on average (DM) 4.1 kg grass cobs, 3.2 kg grass silage, 1.3 kg hay, 2.73 kg dried sugarbeet pulp and 7.3 kg of concentrates containing at 12.5% (i) normal or (ii) formaldehyde treated soyabean oilmeal (SBM), or (iii) normal SBM and the Ca salt of N-hydroxymethyl-DL-methionine (formaldehyde-protected methionine) at 0.2%. For the 3 groups resp. overall daily milk yield averaged 28.8, 26.3 and 27.1 kg with fat 3.32, 3.67 and 3.89% and protein 3.16, 3.16 and 3.33%; fat content was significantly higher with (iii) than with (i). Peak fat-corrected milk (FCM) yield in wk 2-6 was highest and subsequent decline most marked with (iii), but there were no significant differences between groups in the course of lactation during the following 6 months. Fat content was high at the beginning of lactation for all 3 groups but declined to a greater extent with (i) than with (ii) and (iii). In the subsequent 6 months fat content remained highest for cows given (iii).