scholarly journals Association between gestation length and lactation performance, lactation curve, calf birth weight and dystocia in Holstein dairy cows in Iran

2019 ◽  
Vol 16 (4) ◽  
pp. 846-852 ◽  
Author(s):  
Hadi Atashi ◽  
Anise Asaadi
Keyword(s):  
Birth Weight ◽  
Dairy Cows ◽  
Gestation Length ◽  
Lactation Performance ◽  
Lactation Curve ◽  
Holstein Dairy Cows

Leucaena leucocephala as a feed for dairy cows. Direct effect on reproduction and residual effect on the calf and lactation

1971 ◽  
Vol 22 (4) ◽  
pp. 681 ◽  
Author(s):  
RI Hamilton ◽  
LE Donaldson ◽  
LJ Lambourne
Keyword(s):  
Birth Weight ◽  
Dairy Cows ◽  
Leucaena Leucocephala ◽  
Cycle Length ◽  
Residual Effect ◽  
Gestation Length ◽  
Metabolic Rates ◽  
Lactation Curve ◽  
Thyroid Glands ◽  
The Mean

Leucaena 1ericocc.phala was given for periods of 30 days to 14 months to nonlactating dairy cows in all stages of the reproductive cycle. Similar cows were fed on lucerne for comparison. Leucaena did not affect oestrous cycle length, conception rate, or gestation length. Feeding leucaena to heifers pre partum did not affect the mean yield and composition of milk over the first 9 weeks of lactation when a normal milking ration was used post part~lm, but the shape of the lactation curve was slightly flattened. Some mild incoordination and nervous symptoms occurred briefly during gestation in some cows on leucaena. Mild depilation was seen in several cows and quite extensive depilation in one. Calves from cows fed on leucaena had a significantly lower mean birth weight (19.6 kg) than control calves (25.8 kg) and one cow fed on leucaena had a still-born calf. Calf thyroid glands were enlarged and plasma protein-bound iodine levels elevated, but thyroid gland histology was normal. Basal metabolic rates and growth rates of the calves were the same in the two groups.

The effect of rumen-protected methionine and choline on plasma metabolites of Holstein dairy cows

2011 ◽  
Vol 149 (5) ◽  
pp. 639-646 ◽  
Author(s):  
M. ARDALAN ◽  
M. DEHGHAN-BANADAKY ◽  
K. REZAYAZDI ◽  
N. GHAVI HOSSEIN-ZADEH
Keyword(s):  
Dairy Cows ◽  
Dry Matter ◽  
Dry Matter Intake ◽  
Plasma Metabolites ◽  
Lactation Performance ◽  
Plasma Nefa ◽  
Plasma Urea ◽  
Nonesterified Fatty Acids ◽  
Plasma Triglycerides ◽  
Holstein Dairy Cows

SUMMARYForty Holstein dairy cows in their first and second lactations were used from 4 weeks prepartum to 10 weeks postpartum to investigate the effects of feeding ruminally protected methionine and choline on plasma metabolites. Cows were randomly assigned to one of the following treatments in a 2×2 factorial design 4 weeks before their expected calving dates, using randomized blocks based on parity: no supplement (control), 18 g/d of rumen-protected methionine (RPM) product, 60 g/d of rumen-protected choline (RPC) product, or 18 g/d of RPM+60 g/d of RPC. Treatments did not affect plasma triglycerides, glucose, total protein, nonesterified fatty acids (NEFA), β-hydroxybutyrate (BHBA), plasma urea nitrogen (PUN) or aspartate aminotransferase (AST) during the prepartum period. For postpartum plasma NEFA concentrations, there were interactions between RPC or RPM and week postpartum. Feeding RPM increased plasma AST concentrations (P<0·05) and decreased plasma protein concentrations (P<0·05) in postpartum cows. After calving, feeding RPC increased (P<0·05) dry matter intake (DMI), milk yield, 40 g/kg fat-corrected milk (FCM) yield and energy-corrected milk (ECM) yield. This suggests that supplemental RPC can improve lactation performance of dairy cows.

The effects of dexamethasone TMA when used to synchronize parturition in monozygous twin dairy cows

1975 ◽  
Vol 15 (76) ◽  
pp. 591 ◽  
Author(s):  
GW Thomas
Keyword(s):  
Birth Weight ◽  
Latent Period ◽  
Dairy Cows ◽  
Intramuscular Injection ◽  
Gestation Length ◽  
Apparent Effect ◽  
Positive Correlation ◽  
Monozygous Twin

Parturition was induced in one member from each of eight sets of monozygous twin dairy cows by intramuscular injection of 20 mg Dexamethasone trimethylacetate. The resulting gestation lengths were less (P < 0.01) than those of the untreated twin counterparts. The actual 'within' twin calving spread was reduced to nil to 32 days (mean � S.D. 9 � 12 days) from an expected range of 22 to 53 days (mean � S.D. 38 � 12 days). The drug had a variable latent period (time from injection to parturition) and had no apparent effect upon the ensuing lactation yield (P > 0.05) or the subsequent return to postpartum oestrus (P > 0.05). The induced calves had lighter birth weights (P <: 0.01) and a higher mortality (6/8) than calves-from untreated cows (no deaths). There was a significant (P < 0.01) positive correlation (r = 0.846) between gestation length and birth weight of the calf.

1244 Relationships between birth season versus early life starter intake and growth and first lactation performance of Holstein dairy cows

2016 ◽  
Vol 94 (suppl_5) ◽  
pp. 599-599
Author(s):  
B. J. Heins ◽  
D. Ziegler ◽  
D. Schimek ◽  
S. E. Schuling ◽  
B. Ziegler ◽  
...  
Keyword(s):  
Dairy Cows ◽  
Early Life ◽  
Lactation Performance ◽  
Birth Season ◽  
Holstein Dairy Cows
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