Influence of Dietary Protein Concentration on Milk Production by Dairy Cattle in Early Lactation

Cressman, S.G.; Grieve, D.G.; Macleod, G.K.; Wheeler, E. E.; Young, L. G.

doi:10.3168/jds.s0022-0302(80)83149-3

Cited by 69 publications

(22 citation statements)

References 18 publications

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“…In some studies (Leonardi et al, 2003;Colmenero and Broderick, 2006), relatively low CP diets ranging from 13.2 to 15.1% CP, did not affect production compared with diets ranging in CP from 16 to 18%. In other studies, however, decreased dietary CP concentration decreased milk production or milk protein content (Cressman et al, 1980;Wu and Satter, 2000). In the present experiment, the DMP diet decreased milk yield by about 3 kg compared with the AMP diet.…”

contrasting

confidence: 55%

“…Thus, low-CP diets may stimulate urea recycling and provide additional RDP to the rumen microbes when dietary RDP supply is low. Feeding diets deficient in MP and RDP, however, may result in decreased milk and milk protein yields (Cressman et al, 1980;Wu and Satter, 2000;Frank and Swensson, 2002). Therefore, the environmental and economic benefits of decreased dietary N input have to be balanced against potential negative effect on cow productivity and farm profitability.…”

Section: Introductionmentioning

confidence: 99%

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Effects of dietary protein concentration and coconut oil supplementation on nitrogen utilization and production in dairy cows

Lee

Hristov

Heyler

et al. 2011

Journal of Dairy Science

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The objective of this study was to investigate the effect of metabolizable protein (MP) deficiency and coconut oil supplementation on N utilization and production in lactating dairy cows. The hypothesis of the study was that a decrease in ruminal protozoal counts with coconut oil would increase microbial protein synthesis in the rumen, thus compensating for potential MP deficiency. The experiment was conducted for 10 wk with 36 cows (13 primiparous and 23 multiparous), including 6 ruminally cannulated cows. The experimental period, 6 wk, was preceded by 2-wk adaptation and 2-wk covariate periods. Cows were blocked by parity, days in milk, milk yield, and rumen cannulation and randomly assigned to one of the following diets: a diet with a positive MP balance (+44 g/d) and 16.7% dietary crude protein (CP) concentration (AMP); a diet deficient in MP (-156 g/d) and 14.8% CP concentration (DMP); or DMP supplemented with approximately 500 g of coconut oil/head per day (DMPCO). Ruminal ammonia tended to be greater and plasma urea N (20.1, 12.8, and 13.1 mg/dL, for AMP, DMP, and DMPCO diets, respectively) and milk urea N (12.5, 8.3, and 9.5mg/dL, respectively) were greater for AMP compared with DMP and DMPCO. The DMPCO diet decreased total protozoa counts (by 60%) compared with DMP, but had no effect on the methanogens profile in the rumen. Total tract apparent digestibility of dry matter and CP was decreased by DMP compared with AMP. Fiber digestibility was lower for both DMP and DMPCO compared with AMP. Urinary N excretion was decreased (by 37%) by both DMP and DMPCO compared with AMP. The DMP and DMPCO diets resulted in greater milk N efficiency compared with AMP (32.0 and 35.1 vs. 27.6%, respectively). Milk yield was decreased by both DMP and DMPCO compared with AMP (36.2, 34.4, and 39.3 kg/d, respectively) and coconut oil supplementation suppressed feed intake and caused milk fat depression. Coconut oil supplementation decreased short-chain fatty acid (C4:0, C6:0, and C8:0) concentration and increased medium-chain (C12:0 and C14:0) and total trans fatty acids in milk. Overall, the MP-deficient diets decreased N losses, but could not sustain milk production in this study. Coconut oil decreased feed intake and similar to DMP, suppressed fiber digestibility. Despite decreased protozoal counts, coconut oil had no effect on the methanogen population in the rumen.

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contrasting

confidence: 55%

Section: Introductionmentioning

confidence: 99%

Effects of dietary protein concentration and coconut oil supplementation on nitrogen utilization and production in dairy cows

Lee

Hristov

Heyler

et al. 2011

Journal of Dairy Science

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“…An increase in supply of rumen-degradable N (RDN) presumably increases digestibility and thus encourages higher food intakes as demonstrated by Poos, Bull and Hemken (1979). It has been suggested that the milk production responses to increasing the dietary CP level have been the result of rectifying a shortage in either RDP or UDP in the basal ration, particularly RDP (Roffler et al, 1978;Cressman et al, 1980). It has been suggested that the milk production responses to increasing the dietary CP level have been the result of rectifying a shortage in either RDP or UDP in the basal ration, particularly RDP (Roffler et al, 1978;Cressman et al, 1980).…”

Section: Crude Protein Levelmentioning

confidence: 99%

The influence of a formulated excess of rumen degradable protein or undegradable protein on milk production in dairy cows in early lactation

Sloan¹,

Rowlinson²,

Armstrong³

1988

Anim. Sci.

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Following a 3-week covariance period, 30 group-housed dairy cows were individually given one of three diets from week 4 to week 13 of lactation to determine any possible advantage in milk yield and production of feeding levels of undegradable protein (+UDP) or rumen-degradable protein (+RDP) above the minimum levels (control) proposed by the Agricultural Research Council (ARC, 1984). The three concentrates given were formulated to be of equivalent metabolizable energy (ME, 13-5 MJ/kg dry matter (DM)) concentration and each consisted of rolled barley plus a protein supplement: control (crude protein (CP), 129 g/kg DM) 0-35 kg DM fish meal per day; +UDP (CP, 167 g7kg DM) 1-0 kg DM fish meal per day; and +RDP (CP, 167 g/kg DM) 1-5 kg DM soya per day. For each group the total 'concentrate' allowance per animal per day was 11-6 kg fresh weight and was given in three equal feeds. Grass silage (CP 122 g/kg DM, ME 10-6 MJ/kg DM) was given ad libitum. For the control, +UDP and +RDP treatments, respectively, mean grass silage intakes were 8-29, 8-62 and 8-65 kg/day and mean milk yields were 26-6, 26-3 and 26-1 kg/day. These were not significantly different (P > 0-05). Milk fat concentration was lower (P < 005) for the +UDP treatment (36-4 g/kg) in comparison with the control (38-6 g/kg) or the +RDP treatment (39-7 g/kg) but no other milk constituent was significantly influenced by treatment. There was a trend for a greater live-weight gain with treatment +UDP (0-81 kg/day) compared with the other two treatments (control 0-50, +RDP 0-51 kg/day) but there were no differences in condition-score change between treatments. In this trial there was no advantage to feeding formulated levels of UDP or RDP above those proposed by ARC (1984).

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“…Other studies have also observed an improved intake of energy and a concomitant improvement of milk yield from increased concentration of dietary crude protein (Cressman et al, 1980;Edwards et al, 1980;Lundquist et al, 1981). However, Agabriel et al, 1997 compared iso-energetic supply of rolled wheat or a concentrate mixture to a restricted amount of grass silage and found that milk yield was higher for the mixture even though energy intake was the same.…”

Section: Discussionmentioning

confidence: 98%

Concentrate Mixture, Grass Pellets, Fodder Beets, or Barley as Supplements to Silage ad libitum for High-yielding Dairy Cows on Organic Farms

Mogensen¹,

Kristensen²

2003

Acta Agriculturae Scandinavica, Section A - Animal Science

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Influence of Dietary Protein Concentration on Milk Production by Dairy Cattle in Early Lactation

Cited by 69 publications

References 18 publications

Effects of dietary protein concentration and coconut oil supplementation on nitrogen utilization and production in dairy cows

Effects of dietary protein concentration and coconut oil supplementation on nitrogen utilization and production in dairy cows

The influence of a formulated excess of rumen degradable protein or undegradable protein on milk production in dairy cows in early lactation

Concentrate Mixture, Grass Pellets, Fodder Beets, or Barley as Supplements to Silage ad libitum for High-yielding Dairy Cows on Organic Farms

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