English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Tools annual

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

Therefore, 2 levels of rumen-protected amino acids (RPAA) (providing 0 or 11 + 30 g of intestinal absorbable methionine and lysine) were given to dairy cows. The animals were offered 2 diets formulated to cover either 100% (13.3% CP in DM) or 120% (15.1% CP in DM) of the protein requirements. Sixteen Holstein heifers in their 5th week of lactation were assigned to a 4 x 4 latin square design (4-week periods). The diets contained 70% maize silage and 30% concentrate (75% energy mix, 14% soya bean meal, 2% urea, 4% minerals and 5% maize gluten meal 60). The high protein diet was formulated by substituting 13% energy mix (30% dehydrated beet pulps, 25% barley, 25% fine wheat bran, 10% dehydrated alfalfa, 5% molasses, 1% fat and 4% minerals) for the maize gluten meal 60. Increasing protein allowance significantly improved feed intake and consequently increased milk yield, protein yield and content. RPAA increased only protein yield and content. Milk protein content responses to RPAA tended to be higher on the high than on the low protein diet (+1.7 vs +1.0 g/kg; P = 0.12). RPAA increased significantly (P < 0.05) fat yield and content on the low CP level but not on the high protein diet. It is expected that the shortage of other limiting amino acids may explain the lower utilisation efficiency of lysine and methionine supplements for milk protein synthesis in cows fed the low protein diet. Therefore the requirements of an individual amino acid cannot be

Effects of dietary protein level on lactational responses of dairy cows to rumen-protected methionine and lysine