1598 Impact of three rumen-protected lysine prototypes on dairy cow performance, milk composition, and milk casein

2016 ◽  
Vol 94 (suppl_5) ◽  
pp. 777-777
Author(s):  
A. M. Barnard ◽  
B. A. Barton ◽  
C. A. Zimmerman ◽  
R. S. Ordway ◽  
T. F. Gressley
Keyword(s):  
Dairy Cow ◽  
Milk Composition ◽  
Cow Performance ◽  
Milk Casein

1579 Impact of a rumen-protected methionine prototype on dairy cow performance, milk composition, and milk casein

2016 ◽  
Vol 94 (suppl_5) ◽  
pp. 767-768
Author(s):  
A. M. Barnard ◽  
B. A. Barton ◽  
C. A. Zimmerman ◽  
R. S. Ordway ◽  
T. F. Gressley
Keyword(s):  
Dairy Cow ◽  
Milk Composition ◽  
Cow Performance ◽  
Milk Casein

Plasma leptin in transition dairy cows. Effects of body fatness, ambient temperature and dietary factors

2002 ◽  
Vol 2002 ◽  
pp. 92-92 ◽  
Author(s):  
T. Kokkonen ◽  
J. Taponen ◽  
S. Alasuutari ◽  
M. Nousiainen ◽  
T. Anttila ◽  
...  
Keyword(s):  
Food Intake ◽  
Energy Expenditure ◽  
Dairy Cows ◽  
Dairy Cow ◽  
Dietary Factors ◽  
Body Fatness ◽  
Increase Energy Expenditure ◽  
Transition Dairy Cows ◽  
Cow Performance ◽  
Plasma Leptin

In ruminants plasma leptin is increased with increasing body fatness. Leptin acts on hypothalamus to decrease food intake and increase energy expenditure. It is possible that leptin has a key role in transition from pregnancy to lactation of dairy cows. The objective of the present work was to investigate the pattern of plasma leptin concentration, as well as its relationship with other hormones and metabolites and dairy cow performance.

scholarly journals Precalving and early lactation factors that predict milk casein and fertility in the transition dairy cow

2016 ◽  
Vol 99 (9) ◽  
pp. 7554-7567 ◽  
Author(s):  
Rachael M. Rodney ◽  
Jenianne K. Hall ◽  
Charlotte T. Westwood ◽  
Pietro Celi ◽  
Ian J. Lean
Keyword(s):  
Dairy Cow ◽  
Early Lactation ◽  
Milk Casein ◽  
Transition Dairy Cow

143 Effect of Supplementary Selenium Source on Dairy Cow Performance, Antioxidant Status, and Apparent Absorption and Retention

2021 ◽  
Vol 99 (Supplement_3) ◽  
pp. 80-80
Author(s):  
Keira M Cruickshank ◽  
Bayissa Hatew ◽  
Amanda M Gehman ◽  
Karen M Koenig ◽  
Eduardo S Ribeiro ◽  
...  
Keyword(s):  
Dairy Cow ◽  
Fixed Effects ◽  
Antioxidant Status ◽  
Treatment Time ◽  
Rumen Fluid ◽  
Random Effect ◽  
Fecal Excretion ◽  
Adaptation Period ◽  
Apparent Absorption ◽  
Cow Performance

Abstract The objective of this experiment was to determine how source of selenium (Se) affects dairy cow performance, antioxidant status, and apparent absorption and retention. Multiparous Holstein cows (n = 24; 597 ± 49 kg BW) were blocked by days in milk (161 ± 18) and randomly assigned to receive 0.3 mg/kg of either: 1) organic Se (selenized yeast; ORG; Sel-Plex-Alltech); or, 2) inorganic Se (sodium selenite; INO) premix, top dressed and mixed into a ration daily. After an 11-week adaptation period (blood and milk sampled monthly), cows received an intraruminal dose of Se77 (either Se77 yeast or NaSe77O3) followed by a 4-day period of blood and rumen fluid sampling, and total collection of feces, urine, and milk. Data were analyzed using PROC GLIMMIX in SAS with fixed effects of treatment, time, and their interaction, and random effect of block. Daily DMI (23 ± 0.6 kg), milk yield (35 ± 1.2 kg), plasma glutathione peroxidase (64 ± 4.2 U), and serum Se (0.11 ± 0.003 µg/g) were not different between treatments during the adaptation period. Serum Se77 maximum concentration and area under the curve (AUC) were not different between treatments for 72 hours following infusion, but rumen fluid Se77 AUC was higher (P = 0.02) for ORG cows. Apparent absorption (64 ± 1.3%) and retention (44 ± 1.5%) of the Se77 dose did not differ between treatments. The ORG cows had lower urinary excretion (13 vs. 17 ± 0.6%; P < 0.01), higher milk excretion (6 vs. 2 ± 0.3%; P < 0.01), and similar fecal excretion (36 ± 1.3%; P = 0.9) of Se77 compared to INO cows. These results indicate that ORG Se increased Se content of milk and decreased Se excretion in urine, but did not alter performance, antioxidant status, and apparent absorption and retention of Se in mid-lactation cows.

scholarly journals Effect of time of initial grazing date and subsequent stocking rate on pasture production and dairy cow performance

2004 ◽  
Vol 53 (6) ◽  
pp. 489-502 ◽  
Author(s):  
Michael O’Donovan ◽  
Luc Delaby ◽  
Jean Louis Peyraud
Keyword(s):  
Dairy Cow ◽  
Stocking Rate ◽  
Pasture Production ◽  
Cow Performance
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