scholarly journals Effect of supplement crude protein concentration on milk production over the main grazing season and on nitrogen excretion in late-lactation grazing dairy cows

2021 ◽  
Author(s):  
M.J. Doran ◽  
F.J. Mulligan ◽  
M.B. Lynch ◽  
A.G. Fahey ◽  
N.J. Ryan ◽  
...  
Keyword(s):  
Dairy Cows ◽  
Milk Production ◽  
Crude Protein ◽  
Protein Concentration ◽  
Nitrogen Excretion ◽  
Grazing Season ◽  
Grazing Dairy Cows

The effects of level of winter feeding and buffer-feeding during the grazing season on the milk production of January/February calving dairy cows.

1997 ◽  
Vol 1987 ◽  
pp. 29-29
Author(s):  
C.S. Mayne ◽  
S.C.P. Woodcock ◽  
A.J. Clements
Keyword(s):  
Dairy Cows ◽  
Milk Production ◽  
Animal Performance ◽  
High Animal ◽  
Grazing Season ◽  
Grazing Dairy Cows ◽  
Winter Feeding

Buffer-feeding of grazing dairy cows, by allowing cows access to forage for a few hours each day, has been widely advocated as a means of maintaining high animal performance whilst enabling efficient sward utilization. However, in practice, responses to buffer-feeding with January/February calving cows have been extremely variable. The objective of this study was to examine if part of the variability in response could be explained by differences in the level of nutrition during the winter feed period.

Responses to grain feeding by grazing dairy cows

1998 ◽  
Vol 38 (6) ◽  
pp. 541 ◽  
Author(s):  
A. C. Robaina ◽  
C. Grainger ◽  
P. Moate ◽  
J. Taylor ◽  
J. Stewart
Keyword(s):  
Dairy Cows ◽  
Milk Production ◽  
Milk Yield ◽  
Difference Method ◽  
Protein Concentration ◽  
Milk Composition ◽  
Supplementary Feeding ◽  
Sampling Techniques ◽  
Grazing Dairy Cows ◽  
Yield Responses

Summary. Two experiments were conducted on feeding grain supplements to dairy cows during summer. In experiment 1, dairy cows in mid–late lactation were offered one of 2 pasture allowances (about 20 and 40 kg DM/cow.day) with and without a supplement of a grain mix (5 kg of a 70 : 30 mixture of barley and lupins). This experiment was conducted twice over 2 consecutive summer–autumn periods (years 1 and 2). Milk yields were higher at the high pasture allowance and with grain feeding. The marginal response to grain feeding (kg milk/kg grain DM consumed) was 0.7 at both pasture allowances in year 1, and 1.1 and 0.8 at the low and high pasture allowance, respectively, in year 2. Diet had no significant effect on milk composition. Pasture intake was reduced by supplementary feeding and the level of substitution depended on pasture allowance. The alkane-based and sward sampling techniques were used to estimate pasture intake and diet digestibility. Estimates of pasture substitution, based on measurements made with the alkane technique, were 0.3 and 0.6 kg DM reduction in pasture/kg DM grain consumed at the low and high pasture allowance, respectively, in both years. In year 1, the pasture substitution measured with the pasture difference method was 1 kg pasture DM/kg grain DM at both pasture allowances. In year 2, estimates of substitution calculated using the pasture difference method were 0.2 and 0.5 kg pasture DM/kg grain DM at the low and high pasture allowance respectively. In the second experiment (year 3), the effects of level of feeding barley on pasture intake, diet digestibility and milk production were measured during summer. The 4 levels of grain consumed were 0, 1.8, 3.4 and 6.7 kg barley DM/cow. day. Higher grain intake resulted in higher milk yield, higher protein concentration and yields of fat, protein and lactose. Milk yield responses per kilogram of barley diminished from 1.6 at the low barley intake to 0.8 kg milk/kg barley DM at the highest barley intake. It is suggested that higher levels of substitution and a potentially less efficient use of grain contributed to the poorer production responses at higher levels of grain feeding.

Effects of dietary protein concentration on energetic efficiency and methane emission in lactating dairy cows

2009 ◽  
Vol 2009 ◽  
pp. 24-24
Author(s):  
T Yan ◽  
F J Young ◽  
D C Patterson ◽  
C S Mayne
Keyword(s):  
Dairy Cows ◽  
Milk Production ◽  
Methane Emission ◽  
Dietary Protein ◽  
Crude Protein ◽  
Protein Concentration ◽  
Energetic Efficiency ◽  
Dietary Crude Protein ◽  
Lactating Dairy Cows ◽  
Dietary Protein Source

A series of studies have been undertaken to examine effects of dietary protein source and concentration on milk production, energy and nitrogen (N) utilisation efficiencies and fertility in dairy cows. The present study evaluated effects of dietary crude protein (CP) concentration on energetic efficiency and methane emission in lactating dairy cows.

Effects on milk production of increased dietary crude protein by feeding nitogen-fertilised turnips or lupins to dairy cows in mid-lactation

2002 ◽  
Vol 42 (1) ◽  
pp. 1 ◽  
Author(s):  
P. J. Moate ◽  
D. E. Dalley ◽  
J. R. Roche ◽  
C. B. Gow ◽  
C. Grainger
Keyword(s):  
Dairy Cows ◽  
Milk Production ◽  
Milk Fat ◽  
Crude Protein ◽  
Dry Matter ◽  
Protein Concentration ◽  
Basal Diet ◽  
Dietary Crude Protein ◽  
Metabolisable Energy ◽  
Degradable Protein

This experiment investigated whether increased crude protein concentration in turnips fertilised with nitrogen would improve milk production. Dairy cows were offered a basal diet of silage, hay and 5 kg dry matter barley supplemented with 5 kg dry matter turnips fertilised with nitrogen (n = 12) or 5 kg dry matter control turnips (n = 12) over 14 days. The effect of providing a diet isonitrogenous with the nitrogen-fertilised turnip diet and with rumen degradable protein on milk production was also investigated by replacing 1 kg barley with 1 kg lupins; 12 cows were offered 4 kg (dry matter) barley, 1 kg lupins with 5 kg control turnips. The control cows (offered control turnips with barley) consumed 17.8 kg dry matter, 2.34 kg crude protein and 187 MJ metabolisable energy. In comparison with the control cows, cows offered nitrogen-fertilised turnips with barley had lower (P<0.05) daily dry matter and metabolisable energy intakes and higher (P<0.05) crude protein intake whereas cows offered control turnips with barley and lupins had similar daily dry matter intake and higher (P<0.05) intakes of metabolisable energy and crude protein. The cows offered nitrogen-fertilised turnips with barley produced similar yields of milk and milk constituents to those of the control cows (19.6 L milk with 855 g fat, 625 g protein and 951 g lactose daily), reflecting the lower intakes of dry matter and metabolisable energy by the cows offered nitrogen-fertilised turnips with barley compared with that of the control cows. Cows offered control turnips with barley and lupins had a greater (P<0.05) daily yield of milk fat and protein than did the other groups of cows; milk yield was increased by 0.5 L when 1 kg dry matter barley was replaced with 1 kg dry matter lupins. It is economical for farmers to feed turnips in conjunction with barley and lupins to overcome summer shortages of high-quality feeds.

scholarly journals Supplemental concentrates with four levels of crude protein for grazing Dairy Cows

1969 ◽  
Vol 74 (3) ◽  
pp. 281-292
Author(s):  
Paul F. Randel
Keyword(s):  
Dairy Cows ◽  
Milk Production ◽  
Milk Fat ◽  
Crude Protein ◽  
Energy Requirements ◽  
Net Energy ◽  
Daily Production ◽  
Adequate Quality ◽  
Four Levels ◽  
Grazing Dairy Cows

Four treatments (T1 through T4), based on pelleted concentrates varying in as fed crude protein (CP) contents (10.8, 12.2, 13.4, and 15.3%, respectively), but theoretically isocaloric (1.67-1.70 Mcal net energy/kg), were compared for efficacy as pasture supplements. Eighteen multiparous cows began the experiment individually not later than 8 weeks postpartum. Five were assigned to T1 and T3 and four to T2 and T4. Daily concentrate allowances were according to milk production, but 4.5 kg was set as the arbitrary minimum. Nocturnal rotational grazing was in 12 0.5-ha paddocks of little fertilized, heterogeneous, gramineous swards, which fluctuated in quality from adequate to marginal during 11 1/2 months of experimentation. Cows assigned to the four treatments in order produced 21.3 ± 3.0, 22.5 ± 4.4, 20.3 ± 2.5, and 20.4 ± 4.5 kg of milk daily during the 5 days before commencing the experiment, and 14.4 ± 1.2, 16.8 ± 3.9, 15.2 ± 2.4 and 14.2 ± 2.4 kg during the 32 weeks of experimentation. Although treatments did not differ significantly (P>.05) over-all, T1 dropped in daily production by 2.7 kg during the initial 4-week interval and persistency decreased in high-producing cows; T2 also caused a large early decline in production, but superior persistency thereafter. Mean milk fat percentages were 2.78 ± .49, 2.68 ± .44, 2.88 ± .33, and 3.17 ± .37 for 7, through T4. Early depression of milk fat was probably due to high concentrate and inadequate fiber intakes. Concentrate intake ranged from 5.82 kg in T4 to 7.1 0 kg in T2 over 32 weeks; milk/concentrate ratio ranged from 2.33 in T3 to 2.45 in T4. Only in T1 was appreciable liveweight (20 kg) temporarily lost early in the experiment. Concentrates containing 13 to 14% CP can be tentatively recommended as supplements to pastures of adequate quality, when fed to meet energy requirements of cows producing up to at least 20 kg of milk daily.

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