scholarly journals Effect of dietary supplementation or cessation of magnesium-based alkalizers on milk fat output in dairy cows under milk fat depression conditions

2022 ◽  
Author(s):  
A. Razzaghi ◽  
A.R. Vakili ◽  
B. Khorrami ◽  
M.H. Ghaffari ◽  
D.E. Rico
Keyword(s):  
Dairy Cows ◽  
Milk Fat ◽  
Dietary Supplementation ◽  
Milk Fat Depression

scholarly journals DAY-TO-DAY VARIATIONS IN FAT PERCENT OF COW'S MILK

1990 ◽  
Vol 70 (2) ◽  
pp. 731-734 ◽  
Author(s):  
A. S. ATWAL ◽  
J. D. ERFLE
Keyword(s):  
Dairy Cows ◽  
Key Words ◽  
Milk Yield ◽  
Milk Fat ◽  
Rumen Fluid ◽  
Supplemental Feeding ◽  
Fat Percentage ◽  
Milk Fat Depression ◽  
Daily Milk Yield ◽  
Daily Milk

Large day-to-day variations in milk fat, particularly for the morning milkings, were observed in 36 Holstein cows. Changes in percent fat were gradual and produced wavelike patterns in a number of instances. Supplemental feeding of long hay had no effect on acetate/propionate ratio in rumen fluid, daily milk yield or weighted milk fat percentage. Key words: Dairy cows, milk, fat depression, hay

Effects of lucerne hay and barley grain particle sizes on chewing activity, rumen pH and milk composition of Holstein dairy cows

2007 ◽  
Vol 2007 ◽  
pp. 130-130
Author(s):  
A.R. Bayat ◽  
R. Valizadeh ◽  
A.A. Nasserian
Keyword(s):  
Particle Size ◽  
Dairy Cows ◽  
Milk Fat ◽  
Milk Composition ◽  
Barley Grain ◽  
Particle Sizes ◽  
Milk Fat Depression ◽  
Rumen Ph ◽  
Maize Grain ◽  
Chewing Activity

NRC (2001) recommended 250 g/kg dietary neutral detergent fibre (NDF) with a minimum of 190 g/kg dietary forage NDF to prevent milk fat depression. This recommendation does not account for the differences in forage particle size. The forage particle size requirements of dairy cows fed barley grain-based diets can differ from those fed maize grain-based diets (Yang and Beauchemin, 2006). The objective of this experiment was to evaluate the effects of lucerne hay and barley grain particle sizes on chewing activity, rumen pH, milk yield and milk composition using barley grain-based diets.

scholarly journals Milk Fat Depression in Dairy Cows: Role of Particle Size of Alfalfa Hay

1990 ◽  
Vol 73 (7) ◽  
pp. 1823-1833 ◽  
Author(s):  
R.J. Grant ◽  
V.F. Colenbrander ◽  
D.R. Mertens
Keyword(s):  
Particle Size ◽  
Dairy Cows ◽  
Milk Fat ◽  
Milk Fat Depression ◽  
Alfalfa Hay

scholarly journals Milk fat responses to butterfat infusion during conjugated linoleic acid-induced milk fat depression in lactating dairy cows

2013 ◽  
Vol 96 (4) ◽  
pp. 2387-2399 ◽  
Author(s):  
D. Vyas ◽  
U. Moallem ◽  
B.B. Teter ◽  
A.R.K. Fardin-Kia ◽  
R.A. Erdman
Keyword(s):  
Linoleic Acid ◽  
Dairy Cows ◽  
Conjugated Linoleic Acid ◽  
Milk Fat ◽  
Milk Fat Depression ◽  
Lactating Dairy Cows

scholarly journals Milk Fat Depression in Dairy Cows: Role of Silage Particle Size

1990 ◽  
Vol 73 (7) ◽  
pp. 1834-1842 ◽  
Author(s):  
R.J. Grant ◽  
V.F. Colenbrander ◽  
D.R. Mertens
Keyword(s):  
Particle Size ◽  
Dairy Cows ◽  
Milk Fat ◽  
Milk Fat Depression

scholarly journals Effect of Dietary Vitamin E on Rumen Biohydrogenation Pathways and Milk Fat Depression in Dairy Cows Fed High-Fat Diets

2006 ◽  
Vol 89 (2) ◽  
pp. 685-692 ◽  
Author(s):  
J. Pottier ◽  
M. Focant ◽  
C. Debier ◽  
G. De Buysser ◽  
C. Goffe ◽  
...  
Keyword(s):  
Vitamin E ◽  
Dairy Cows ◽  
Milk Fat ◽  
Dietary Vitamin ◽  
High Fat ◽  
Milk Fat Depression ◽  
High Fat Diets ◽  
Fat Diets

Effect of dietary supplementation with fish oil during the transition period on milk production, plasma metabolites and postpartum anoestrus interval in grazing dairy cows

2011 ◽  
Vol 51 (5) ◽  
pp. 481 ◽  
Author(s):  
A. Mendoza ◽  
D. Crespi ◽  
A. Hernández ◽  
N. Roura ◽  
H. Valentín ◽  
...  
Keyword(s):  
Fish Oil ◽  
Dairy Cows ◽  
Milk Yield ◽  
Postpartum Period ◽  
Milk Fat ◽  
Dietary Supplementation ◽  
Plasma Metabolites ◽  
Ovarian Activity ◽  
Dominant Follicle ◽  
Grazing Dairy Cows

Inclusion of fish oil (FO) in the diet of dairy cows could improve the energy status and milk yield and reduce the interval from calving to first postpartum ovulation, but the effects may differ depending on the specific period of supplementation. To test these hypotheses, 28 pregnant Holstein heifers were randomly assigned to four treatments in a 2 × 2 factorial design: prepartum oral drench of FO (0 or 140 g/cow.day) for 21 days before calving, and/or postpartum oral drench of FO (0 or 190 g/cow.day) for 21 days after calving. Prepartum, heifers grazed in native pastures with supplements of wheat silage and wheat bran, while postpartum, cows grazed on improved pastures with addition of concentrates and corn silage. No interaction between prepartum and postpartum FO was detected for any variable analysed. Prepartum and postpartum total DM intake, milk yield, protein yield and percentage were not different among treatments. Milk fat percentage (3.83 versus 3.34 ± 0.10%) and yield (0.88 versus 0.73 ± 0.04 kg/day) decreased with postpartum FO but were not affected by prepartum FO. Prepartum and postpartum body condition score and plasma concentration of non-esterified fatty acids and cholesterol were not different among treatments, but urea concentration was higher in cows drenched with FO during prepartum (5.91 versus 4.64 ± 0.35 mM). Proportion of cows that ovulated the dominant follicle of the first postpartum wave and days to first postpartum ovulation, as determined by ovarian ultrasonography, were not affected by drenching with FO, but size of the dominant follicle in the first wave was decreased when FO was drenched only during the pre- or postpartum period compared with drenching in both periods. Dietary supplementation with FO during the postpartum period affected milk fat synthesis but more research is needed to establish its effects on resumption of ovarian activity in grazing dairy cows.

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