scholarly journals Effect of yeast culture on milk production and metabolic and reproductive performance of early lactation dairy cows

2009 ◽  
Vol 51 (1) ◽  
Author(s):  
Piret Kalmus ◽  
Toomas Orro ◽  
Andres Waldmann ◽  
Raivo Lindjärv ◽  
Kalle Kask
Keyword(s):  
Dairy Cows ◽  
Milk Production ◽  
Reproductive Performance ◽  
Yeast Culture ◽  
Early Lactation

scholarly journals Influence of Energy Balance on Reproductive Performance and Milk Production of Dairy Cows at Pre-partum and Early Lactation Periods

2013 ◽  
Vol 5 (3) ◽  
pp. 98-102
Author(s):  
K.B.M. Nishany ◽  
S. Ramachandra ◽  
M.B.P. Kumara Mahipala ◽  
V.P. Jayawardane ◽  
M.P.B. Wijayagunawardane
Keyword(s):  
Energy Balance ◽  
Dairy Cows ◽  
Milk Production ◽  
Reproductive Performance ◽  
Early Lactation

scholarly journals Effects of chromium supplementation on early lactation performance of Holstein cows

1996 ◽  
Vol 76 (2) ◽  
pp. 221-230 ◽  
Author(s):  
W. Z. Yang ◽  
D. N. Mowat ◽  
A. Subiyatno ◽  
R. M. Liptrap
Keyword(s):  
Health Status ◽  
Luteinizing Hormone ◽  
Dairy Cows ◽  
Milk Production ◽  
Reproductive Performance ◽  
Metabolic Disorders ◽  
Milk Composition ◽  
Holstein Cows ◽  
Early Lactation ◽  
Lactation Performance

Two experiments were conducted to evaluate the effects of chromium (Cr) supplementation on early lactation performance of Holstein cows. Experiment 1 involved 12 primiparous (PP) and 22 multiparous (MP) cows, while exp. 2 involved 18 PP and 22 MP cows. In each trial, cows were fed total mixed rations (TMR) and assigned to one of two treatments: control or 0.5 mg kg−1 supplemental chelated Cr from week 6 prepartum to week 16 postpartum The cortisol response to synthetic adrenocorticotropin (ACTH) intramuscular (i.m.) and the luteinizing hormone (LH) response to synthetic gonadotropin-releasing hormone (GnRH) i.m. were evaluated as well, during weeks 2 and 6 postpartum in exp. 2 During the first 16 wk of lactation, supplemental Cr tended to increase milk yields in PP cows by 13% (P = 0.06) and increased milk production by 7% (P < 0.05) in exps. 1 and 2, respectively, but had no effect in MP cows. Despite increased milk yield, Cr supplementation had no adverse effect on milk composition, reproductive performance, or health status. Furthermore, Cr supplementation tended to increase the milk lactose content in PP cows. Supplemental Cr reduced serum β-hydroxybutyrate levels and may reduce subclinical ketosis in MP cows. In addition, in overconditioned, aged cows, Cr supplementation may reduce the incidence of certain other metabolic disorders. Peak values and production rates of cortisol in Cr-supplemented cows tended to be greater (P < 0.10) than in control cows at week 6 Basal LH concentrations did not differ between the two treatments for either week However, the Cr-supplemented cows released less (P < 0.05) LH than did control cows at week 6. Results from hormonestimulation tests suggest that the Cr-supplemented cows may have experienced a greater stress with their increased milk production. However the time in postpartum anestrus and the time to conception were similar, suggesting that Cr supplementation may have mitigated the slower return to fertility usually seen in higher producing PP dairy cows. Further study is needed to determine the effects of Cr supplementation on reproductive performance, health status, and metabolic disorders in dairy cows. Key words: Chromium, milk production, luteinizing hormone, cortisol, reproduction, dairy cows

scholarly journals High- and low-purity glycerine supplementation to dairy cows in early lactation: effects on silage intake, milk production and metabolism

animal ◽  
2013 ◽  
Vol 7 (9) ◽  
pp. 1479-1485 ◽  
Author(s):  
A.Werner Omazic ◽  
M. Tråvén ◽  
J. Bertilsson ◽  
K. Holtenius
Keyword(s):  
Dairy Cows ◽  
Milk Production ◽  
Early Lactation

Associations between early lactation milk protein concentrations and the intervals to calving for Holstein cows of differing parity

2017 ◽  
Vol 57 (10) ◽  
pp. 2100 ◽  
Author(s):  
Jack Fahey ◽  
John M. Morton ◽  
Martin J. Auldist ◽  
Keith L. Macmillan
Keyword(s):  
Dairy Cows ◽  
Reproductive Performance ◽  
Milk Protein ◽  
Holstein Cows ◽  
Breeding Period ◽  
Gestation Length ◽  
Calving Interval ◽  
Early Lactation ◽  
Average Interval ◽  
Lactating Dairy Cows

High milk protein concentrations (MP%) have been positively associated with the reproductive performance of lactating dairy cows. No studies have measured the effects of this association on subsequent calving dates in multiparous cows, nor assessed whether the underlying causal mechanisms are present in nulliparous heifers. Holstein cows (primiparous = 918; multiparous = 4242) were selected from herds that had seasonally concentrated calving patterns resulting from seasonally restricted breeding periods. In seasonally calving herds, the date of a herd’s planned start of calving (PSC date) is the average gestation length of 282 days after the date that the preceding breeding period commenced, so that the interval from the herd’s PSC date to each cow’s actual calving date (PSC-to-calving interval) primarily reflects the time to conception from the start of the breeding period in the previous year. This measure was used to compare associations between the average MP% during the first 120 days of lactation and time to the calving that initiated that lactation in primiparous and multiparous cows. Early lactation MP% was negatively associated with PSC-to-calving interval. A 1% difference in MP% was associated with an 8-day difference in the average PSC-to-calving interval in primiparous cows and a 31–35-day difference in the average interval in multiparous cows. The observed associations between early lactation MP% and PSC-to-calving interval are likely to involve determinants present during a cow’s breeding period that affect the probability of conception. Some of these determinants are not restricted to early lactation as the association between MP% and PSC-to-calving interval in primiparous cows is a reflection of the reproductive performance in nulliparous heifers at ~15 months of age.

Prediction of body weight and composition in lactating dairy cows: Relationship between body condition score and body composition

2005 ◽  
Vol 2005 ◽  
pp. 19-19
Author(s):  
T. Yan ◽  
R. E. Agnew ◽  
C. S. Mayne
Keyword(s):  
Body Composition ◽  
Body Weight ◽  
Dairy Cows ◽  
Milk Production ◽  
Body Condition ◽  
Body Condition Score ◽  
Early Lactation ◽  
Lactating Dairy Cows ◽  
Condition Score ◽  
Body Concentration

Body condition of lactating dairy cows varies at different stages of lactation. Cows usually mobilise their body reserves to provide energy and protein for milk production in early lactation, and gain weight to deposit energy and protein for pregnancy at a later stage. The objective of the present study was to examine relationships between body condition score (CS) and body concentration of lipid, CP and energy.

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