Nutritional and Keeping Quality of Total Mixed Ration Briquettes Produced for Lactating Dairy Cows

Fertility of lactating dairy cows is associated with reduced progesterone (P4) concentration compared with nonlactating animals. The objective of the current study was to determine whether P4 during growth of the first follicular wave (FFW) affects embryo quality. Lactating Holstein cows at 33±3 days post partum were allocated to one of three treatments. Cows in the FFW and FFW with P4 (FFWP) treatments started the superstimulation protocol on day 1 of the estrous cycle and second follicular wave (SFW) cows started the superstimulation protocol on estrous cycle day 7. Cows were superstimulated with 400 mg of NIH-FSH-P1 (FSH) given twice daily for 5 days, two prostaglandin F2α (PGF2α) injections given with the ninth and tenth injections of FSH, GNRH given 48 h after the first PGF2α injection, and timed insemination 12 and 24 h after the GNRH injection. Cows in the FFWP treatment received two intravaginal P4 inserts during the superstimulation. Embryos were recovered 6.5 days after artificial insemination and excellent/good and fair embryos were frozen and transferred. Blood was sampled daily from estrous cycle day 0 until insemination from donor cows. During the superstimulation protocol, P4 was (P<0.01) greatest for SFW cows followed by FFWP and FFW cows respectively. The percentage of embryos–oocytes from SFW and FFWP cows classified as excellent/good and fair embryos was (P=0.02) greater than those of FFW cows. Pregnancy per embryo transfer was not (P≥0.73) affected by embryo donor treatment. Reduced embryo quality of cows induced to ovulate the follicles from the first follicular wave is a consequence of reduced P4 during follicle growth.

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Feeding high proportions of barley grain in a total mixed ration perturbs diurnal patterns of plasma metabolites in lactating dairy cows

Journal of Dairy Science ◽

10.3168/jds.2008-1465 ◽

2009 ◽

Vol 92 (3) ◽

pp. 1084-1091 ◽

Cited By ~ 39

Author(s):

B.N. Ametaj ◽

D.G.V. Emmanuel ◽

Q. Zebeli ◽

S.M. Dunn

Keyword(s):

Dairy Cows ◽

Barley Grain ◽

Plasma Metabolites ◽

Total Mixed Ration ◽

Diurnal Patterns ◽

Lactating Dairy Cows

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Adding straw to a total mixed ration and the method of straw inclusion affects production and eating behaviour of lactating dairy cows

Advances in Animal Biosciences ◽

10.1017/s2040470010002384 ◽

2010 ◽

Vol 1 (1) ◽

pp. 95-95 ◽

Cited By ~ 1

Author(s):

D J Humphries ◽

D E Beever ◽

C K Reynolds

Keyword(s):

Dairy Cows ◽

Eating Behaviour ◽

Total Mixed Ration ◽

Lactating Dairy Cows

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Influence of Feeding Dehydrated Poultry Waste on Composition and Organoleptic Quality of Milk1

Journal of Food Protection ◽

10.4315/0362-028x-40.1.29 ◽

1977 ◽

Vol 40 (1) ◽

pp. 29-31 ◽

Cited By ~ 6

Author(s):

J. C. BRUHN ◽

G. D. REIF ◽

H. TOONE ◽

J. H. EVANS

Keyword(s):

Dairy Cows ◽

Milk Quality ◽

Poultry Waste ◽

Quality Factors ◽

Lactating Dairy Cows ◽

Period 2 ◽

Lead Zinc ◽

Copper Lead ◽

Composite Samples

A double reversal trial with three, 4-week periods was used to determine the effect on milk quality of feeding dehydrated poultry waste to lactating dairy cows. Fifteen cows were fed a control ration for 4 weeks (Period 1), followed by an experimental ration containing dehydrated poultry waste for 4 weeks (Period 2), and then by the control ration for 4 weeks (Period 3). Milk was collected daily and scored by five judges using the ADSA milk flavor scoring guide. Milk compsition (fat, protein, lactose, and solids-not-fat) was determined on alternate days. During Periods 2 and 3 weekly composite samples were collected to determine concentrations of cadmium, copper, lead, zinc, and tocopherol. No significant differences were found in any of the milk quality factors studied.

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