+ Site Statistics
+ Search Articles
+ PDF Full Text Service
How our service works
Request PDF Full Text
+ Follow Us
Follow on Facebook
Follow on Twitter
Follow on LinkedIn
+ Subscribe to Site Feeds
Most Shared
PDF Full Text
+ Translate
+ Recently Requested

The influence of the degradability of concentrate protein in the rumen and of the lysine content of the concentrate on growth and feed efficiency in early weaned calves



The influence of the degradability of concentrate protein in the rumen and of the lysine content of the concentrate on growth and feed efficiency in early weaned calves



Netherlands Journal of Agricultural Science 32(2): 107-118



In 2 feeding trials involving 96 rearing calves each and based on a 2 .times. 3 factorial design, a comparison was made between concentrates containing rapidly and slowly rumen-degradable protein on the one hand and between concentrates with 3 lysine levels, i.e., 6, 7 and 8 g/kg or 7, 8 and 9 g/kg on the other hand. In a 3rd feeding trial involving 84 animals, 2 feeds containing rapidly and slowly degradable protein were compared. The calves were weaned at 6 wk and remained in the trial an additional 5-6 wk. Concentrates were fed ad lib from the age 21 days and in 2 trials after weaning the animals were fed according to a plan based on body weight. Hay or prewilted grass silage was fed ad lib. The difference in protein degradability between feeds with rapidly degradable protein and those with slowly degradable protein was 28% and 36% in the 2nd and 3rd trial, respectively, as measured with the nylon bag technique. Those experimental treatments involving concentrates with slowly degradable protein resulted in a higher daily weight gain. Only in the last trial differences were statistically significant. Feed efficiency was usually better as well. An increase in the lysine content of the concentrate from 6-8 g/kg or from 7-9 g/kg resulted in a statistically significant linear rise in daily weight gain and a linear rise in feed efficiency. Rearing calves require a lysine content of at least 8 g/kg concentrate to ensure rapid growth up to 100 kg body weight. In 2 of the 3 trials the consumption of roughage (1 .times. pre-wilted grass silage, 1 .times. hay) was positively affected by the presence in the concentrate of slowly degradable protein. The lysine content of the concentrate had no significant effect on roughage consumption.

Please choose payment method:






(PDF emailed within 1 workday: $29.90)

Accession: 006701230

Download citation: RISBibTeXText


Related references

Effect of protein level in the concentrate feed on early-weaned calves. Bulletin Technique, Centre de Recherches Zootechniques et Veterinaires de Theix (56): 9-14, 1984

Influence of source of rumen escape protein rep on growth feed efficiency and nutrient digestibility in weaned dairy calves. Journal of Animal Science 69(Suppl. 1): 527, 1991

Effects of ratio of concentrate to roughage and kinds of hay in a ration on estimating the rumen degradability of protein of formulated concentrate. Asian-Australasian Journal of Animal Sciences 5(1): 19-24, 1992

The protein requirement of the ruminant calf I The effect of protein content of the concentrate mixture on the performance of calves weaned at an early age. Anim Prod1: 7-21, 1967

The protein requirement of the ruminant calf II Further studies on the effect of protein content of the concentrate mixture on the performance of calves weaned at an early age. Anim Prod1: 23-33, 1967

Influence of rumen passage rate of solids and liquids on protein rumen degradability for concentrate. Nunes, A F, Portugal, A V, Costa, J P, Ribeiro, J R EAAP Publication; Protein metabolism and nutrition 249-250, 1996

Investigation into various proportions of concentrate and hay on the growth of early weaned calves. Pol' nohospodarstvo 21(11/12): 1019-1027, 1975

Investigation into various proportions of fodder concentrate and hay on the growth in early weaned calves. Pol'nohospodarstvo 1 (11 12) 1019-1027, 1975

Green protein concentrate in feed mixtures for early-weaned piglets. Zhivotnovodstvo (12): 39-40, 1984

Some considerations on estimating a value of the rumen degradability of protein of the mixed ration for early weaned calves from the values of ingredients. Journal of the Faculty of Agriculture Hokkaido University 63(1): 54-57, 1986

Influence of particle size and dry matter content of grass silage at different concentrate levels on rumen fermentation patterns, digestibility and feed intake of cattle. 1. Experimental methods and results on feed quality and studies on rumen-fistulated cattle. Zuchtungskunde 75(3): 176-189, 2003

Milk production in early lactation dairy cows given grass silage ad libitum influence of concentrate energy source crude protein content and level of concentrate allowance. Animal Production 46(3): 317-332, 1988

The influence of protein content and varying amounts of soy protein concentrate in milk replacer on growth of male Holstein calves. Journal of Animal Science 74(Suppl. 1): 276, 1996

The effects of increasing whey protein concentrate as a lysine source on performance of segregated early-weaned pigs. Journal of Animal Science 74(Suppl. 1): 195, 1996

The in situ ruminal degradability of concentrate feedstuffs in steers as affected by level of feed consumption and ratio of grass silage to concentrate. Animal Feed Science and Technology 100(1/2): 15-30, 2002