0762 Feeding low crude protein diets in lactating dairy cows during summer months: 1. Improvements in milk production and nitrogen utilization

The study objective was to determine the effects of rumen-protected methionine (Met) by microencapsulation (RPM) on amino acid (AA) supply to the udder, milk production, and manure nitrogen (N) losses of dairy cows. A corn and soybean-based diet deficient in metabolizable Met (~10 g/d) was supplemented with RPM providing 0, 11.0, 19.3, and 27.5 g/d of Met. Dry matter intake (DMI), milk production, plasma essential AA (EAA), mammary plasma flow (MPF), and fecal (FN) and urinary N (UN) outputs (g/d) were determined. The RPM increased linearly milk yield, milk protein yield, and energy corrected milk yield (p < 0.040) without affecting DMI. Milk protein yield increased by 50 g/d for the 19.3 vs. 0 g/d dose (p = 0.006) but the rate of increment decreased for 27.5 g/d dose. Plasma Met, and MPF increased linearly with RPM dose (p < 0.050). Apparent total tract digestibility of crude protein (p = 0.020) and FN (p = 0.081) decreased linearly with RPM. The UN did not change but total manure N decreased linearly with RPM (p = 0.054). The RPM (19.3 g/d) seemed to help cows overcome the metabolizable Met deficiency while mitigating manure N excretions to the environment.

Download Full-text

The effect of level of protein in the concentrates on hay intake, milk production and digestive processes by Saanen goats

Proceedings of the British Society of Animal Production (1972) ◽

10.1017/s0308229600035583 ◽

1987 ◽

Vol 1987 ◽

pp. 124-124

Author(s):

M S Badamana ◽

J D Sutton

Keyword(s):

Dairy Cows ◽

Milk Production ◽

Milk Yield ◽

Present Experiment ◽

Crude Protein ◽

Lactating Dairy Cows ◽

Lactating Goats ◽

Forage Intake ◽

Digestive Processes

Increasing the crude protein (CP) concentrations of dairy concentrates in mixed diets has been found to increase milk yield and forage intake in a curvilinear manner in lactating dairy cows. In an experiment with lactating goats, linear increases in milk yield were observed as the CP in the concentrates was increased from 117 to 185 gAg DM. The purpose of the present experiment was to see if increases in hay intake and milk yield could be established to still higher levels of CP in the concentrates and to measure various associated aspects of digestion.

Download Full-text

0749 Feeding low crude protein diets in lactating dairy cows during summer months: 2. Improvements in energy metabolism

Journal of Animal Science ◽

10.2527/jam2016-0749 ◽

2016 ◽

Vol 94 (suppl_5) ◽

pp. 359-359

Author(s):

J. Kaufman ◽

K. Kassube ◽

K. G. Pohler ◽

A. G. Rius

Keyword(s):

Energy Metabolism ◽

Dairy Cows ◽

Crude Protein ◽

Lactating Dairy Cows ◽

Protein Diets

Download Full-text

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

Proceedings of the British Society of Animal Science ◽

10.1017/s1752756200028635 ◽

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.

Download Full-text

Performance of Lactating Dairy Cows Fed Dried Sardines

Journal of Agricultural and Marine Sciences [JAMS] ◽

10.24200/jams.vol4iss1pp35-42 ◽

1999 ◽

Vol 4 (1) ◽

pp. 35 ◽

Cited By ~ 1

Author(s):

A.S. AI-Abri ◽

C.D. Lu ◽

R.J. Early ◽

A. Srikandakumar ◽

O. Mahgoub ◽

...

Keyword(s):

Dairy Cows ◽

Milk Production ◽

Crude Protein ◽

Volatile Fatty Acids ◽

Control Diet ◽

Experimental Period ◽

Milk Composition ◽

Ruminal Ph ◽

Lactating Dairy Cows ◽

Continuous Feeding

To utilize locally available feed resources with livestock production in hot climates, dried sardines were incorporated into diets for lactating dairy cows. Fourteen Holstein and 13 Australian Milk Zebu multiparous cows were used in a 70-day continuous feeding experiment. lsonitrogenous and isoenergetic diets containing either soybean meal or dried sardines (supplied 40% of dietary crude protein) were fed ad - libitum. Comparisons between diets were made during the 7-week experimental period. The experiment was conducted as a 2 x 2 factorial arrangement of treatment, with diet and breed as main factors. Ruminal pH, ammonia N, total and individual volatile fatty acids concentrations were not altered by the feeding of dried sardines. Intakes of dry matter, energy, crude protein, and acid detergent fiber were lower (P<0.05) in both breeds of cows fed dried sardines. Intakes of ether extract and ash were higher (P<0.05) in cows fed dried sardines. Although it was not statistically significant, milk production was higher (P>0.05) in Holstein cows fed dried sardines than those fed the control diet (16.2 vs 15.1 kg/d). Feeding of dried sardines did not affect milk composition and compositional yields. Milk production was higher (P<0.01) in Holstein than Australian Milk Zebu cows. Effect of diet and breed interaction on milk production was significant (P<0.01 ). Potential of feeding marine proteins may be higher for higher milk producers (Holstein) than lower producers (Australian Milk Zebu). Reproduction parameters, body condition scores, and heat-stress associated parameters were not affected by the feeding of dried sardines. This study suggests that dried sardines could be incorporated into diets of lactating dairy cows without affecting milk production.

Download Full-text