Five experiments are reported in which young growing or breeding cattle were offered supplements which contained non protein nitrogen (NPN) or protein during winter when grazing carpet grass pastures. Significant and economic increases in growth were obtained when a slowly degradable protein pellet (cottonseed, meat and fish meals) 'was offered twice-aweek when available pasture was in excess o...

An experiment was conducted to examine the effect that various isoenergetic diets, containing different quantities of soluble carbohydrate and fiber and different types of starch, have on nitrogen (N) balances. Six lactating dairy cows in early to midlactation consuming grass silage diets with not less than 600 g/kg total DMI as forage were used in the experiment. Four concentrates were prepare...

An'outline of the recentAgricultural Research Council (UK) proposals for assessing protein requirements of ruminants (ARC, 1980), is presented, The importance of considering both rumen degradable protein (RDP) and rumen undegradable protein (WYP) is n&d, Calculations of the protein requirements and formulation of rations for (i) a high yielding' cow in early lactation and (ii) a growing/fatteni...

Intercropping legume with cereal is an extensively applied planting pattern in crop cultivation. However, forage potential and the degradability of harvested mixtures from intercropping system remain unclear. To investigate the feasibility of applying an intercropping system as a forage supply source to ruminants, two consecutive experiments (experiments 1 and 2) involving a field cultivation t...

In goats, alpha-s1 casein polymorphism is related to different rates of protein synthesis. Two genetic variants, A and F, have been identified as strong and weak alleles based on a production of 3.5 and 0.45 g/l of alpha-s1 casein per allele. The aim of the trial was to test if goats can self-regulate their diet as a function of the genetic aptitude to produce milk at different casein levels. T...

To evaluate the effects of balancing total diet degradable intake protein with dietary total digestible nutrients (TDN), we conducted two studies during 2 yr with 100 (302 +/- 8 kg initial BW) mixed-breed yearling steers and 12 ruminally cannulated steers (526 +/- 28 kg). Steers individually received one of four supplements 5 d/wk while grazing dormant native tallgrass prairie. Supplements incl...

the aim of this research was determination of nutritive value of cressa cretica with gas test method, in vivo digestibility and degradability with nylon bag method in three phenological stages. the amount of crude protein decreased significantly in seeding stage. but the amount of ndf and adf increased in seeding stage. the degradability of dry matter and rapid and slowly degradable fractions d...