shimon carmi
Milk yield was 41 kg/d with 3.5% fat and 3% true protein.

Claudia Parys Do you think the above BF and true proteins in all the dairy breed cattle ,
because genetically some breeds has low bf content e.g. HF .thanks

Abdul Qader Samsor
Yes, the genetic potential for milk yield and for components is different for the different breeds. Holsteins cows have lower milk fat and milk protein than Jersey cows for example. The requirement for nutrients depends on the breed (and within breed on milk yield, milk components, DIM and so on).

Optimizing rations for nutrients means to optimize the nutrient supply from feeds to meet the cow's requirement for all nutrients. Rumen-protected methionine Mepron is the most efficient source of the amino acid methionine to meet the requirement for this essential amino acid.

well done

Syeedmojtaba seyed moumen. It is fantastic. I utilised

In a follow up experiment with the same team at USDA Wisconsin, a Negative Control treatment was also included to allow a better assessment of what part of the improvements in N-efficiency were simply due to reducing N intake and what part were due to an improvement in performance through amino acid balancing.

Effect of feeding different sources of rumen-protected methionine on milk production and N-utilization in lactating cows : Chen et al J. Dairy Sci. 94 : 1978-1988

Lowering CP content in the ration from 16.8% to 15.6% without any attempt to amino acid balance, did not reduce milk protein but did reduce milk fat. N-efficiency (Milk N/N intake %) was improved from 30.2 to 32.4 (+7.3%). When Smartamine M was added to the 15.6% ration to respect a metabolizable LYS to MET ratio according to NRC 2001 of 3 to 1, daily milk fat yield was improved by 200 grams and milk protein by 90 grams, pushing the N-efficiency up to 34.2 (+13.2% vs the 16.9% CP ration)

Judicious use of Amino acid balancing to lower ration CP levels can improve performance and improve efficiency of N use essential in our goals of sustainable production.

The objective should be to reach at least 40% of intake N being converted into productive N

Methionine required if cow produce less than 20 Ltrs milk per day and what was the right douses of Methionine for 35 Ltrs Milking cow.