scholarly journals Studies on some non-genetic factors affecting reproductive performance of Holstein Friesian Deoni crossbred cows

2015 ◽  
Vol 10 (12) ◽  
pp. 1508-1516
Author(s):  
Zewdu W ◽  
M Thombre B ◽  
V Bainwad D
Keyword(s):  
Reproductive Performance ◽  
Genetic Factors ◽  
Factors Affecting ◽  
Crossbred Cows ◽  
Holstein Friesian

Factors affecting reproductive performance in German Holstein–Friesian cows with a special focus on postpartum mastitis

2004 ◽  
Vol 86 (1-3) ◽  
pp. 233-238 ◽  
Author(s):  
I.C. Klaas ◽  
U. Wessels ◽  
H. Rothfuss ◽  
B.-A. Tenhagen ◽  
W. Heuwieser ◽  
...  
Keyword(s):  
Reproductive Performance ◽  
Special Focus ◽  
Factors Affecting ◽  
Holstein Friesian ◽  
Friesian Cows

Environment and genetic factors affecting wool production from sub-tropical coarse wool sheep

1977 ◽  
Vol 88 (2) ◽  
pp. 443-447 ◽  
Author(s):  
A. M. Aboul-Naga ◽  
E. A. Afifi
Keyword(s):  
Genetic Correlation ◽  
Reproductive Performance ◽  
Genetic Parameters ◽  
Genetic Factors ◽  
Factors Affecting ◽  
Wool Production ◽  
Body Weights ◽  
Performance Traits ◽  
Heritability Estimates ◽  
Fleece Weight

SUMMARYWool production from different flocks of Ossimi, Rahmani and Barki Egyptian local sheep, raised at six different locations in the country was studied. Different genetic parameters for greasy fleece weight of the three breeds were estimated.Location was of significant effect on annual greasy fleece weight of Rahmani sheep only. With the adjustment for differences in yield percentages, differences in clean wool production from one location to another were slight for the three breeds. Age of ewe was of highly significant effect on annual greasy fleece weight.Heritability estimates of annual greasy fleece weight of the ewes were found to be generally low in the three breeds (range 0·00–0·34). The estimates differed markedly with age; those of the yearling fleece weight of Rahmani and Barki ewes were the highest, being 0–19 and 0–34, respectively.Repeatability estimates of annual greasy fleece weight were also low, being 0·11–0·04 and 0·29 for Ossimi, Rahmani and Barki ewes, respectively.Estimates of genetic correlation between yearling greasy fleece weight of the Ossimi and Rahmani ewes and their weaning and yearling body weights were high and positive. Those between annual greasy fleece weight of the ewes and their reproductive performance traits differed greatly in the two breeds.

A review of the genetic and non-genetic factors affecting extended lactation in pasture-based dairy systems

2015 ◽  
Vol 55 (8) ◽  
pp. 949 ◽  
Author(s):  
Mary Abdelsayed ◽  
Peter C. Thomson ◽  
Herman W. Raadsma
Keyword(s):  
Milk Production ◽  
Milk Yield ◽  
Genetic Factors ◽  
Genetic Selection ◽  
Factors Affecting ◽  
Environmental Interactions ◽  
Holstein Friesian ◽  
Component Traits ◽  
Dairy Systems ◽  
Extended Lactation

Milk production per cow has significantly increased over the last 50 years due to the strong genetic selection for increased milk production; associated with this increased production has been a decline in reproductive performance. As a result, superior-yielding cows that have failed to get into calf in a traditional 12-month calving system may be carried over and milked continuously for another 6 months instead of being culled. Studies indicate that cows are able to achieve lactations greater than 305 days and up to 670 days under pasture-based systems, with and without the use of supplementary feeds. Extended lactations of 16 months are most common and economically viable in Australian dairy systems. These findings indicate a potential role for extended lactation in countries such as Australia, where pasture-based dairy systems in which Holstein-Friesian dairy cows predominate. However, variation between cows in their milk yield profiles and the ability of cows to reach a planned dry-off date over an extended lactation occurs depending on the cow’s genetic strain, nutrition and environmental interactions, with certain strains of cow being better suited to extended lactation than others. The focus of this review is to examine the scope for genetic improvement as well as important considerations (non-genetic factors) when selecting suitable animals for extended lactation in pasture-based dairy systems, with an emphasis on Australian systems. These considerations include the impacts of cow strain, nutrition, milk production, and biological and economical costs associated with extended lactation. Methods for modelling extended lactation and estimating genetic parameters of lactation persistency, milk yield and component traits under extended lactation will be addressed and future directions for further research suggested.

scholarly journals NON-GENETIC FACTORS AFFECTING THE INCIDENCE OF CALVING ABNORMALITIES IN CROSSBRED COWS

2021 ◽  
pp. 19-22
Author(s):  
Nitin Wakchaure ◽  
Ravinder Malhotra ◽  
Udita Chaudhary ◽  
Dilip Deokar
Keyword(s):  
Genetic Factors ◽  
Secondary Data ◽  
Reproductive Efficiency ◽  
Dairy Herds ◽  
Reproductive Disorders ◽  
Factors Affecting ◽  
Crossbred Cows ◽  
Stage Of Lactation ◽  
Dairy Animals ◽  
Very High

Background: Calving abnormalities incudes reproductive disorders such as abortion and dystocia which affects the herd life and reproductive efficiency of dairy animals and ultimately the economics of dairy herds because of replacement from herd. Generally, crossbreds cows are more susceptible for the incidence of calving abnormalities as compared to the indigenous breeds. Methods: For the present study, secondary data of calving abnormalities such as abortion and dystocia was collected from the disease records of Phule Triveni crossbred cows. The data consists of 2168 number of calvings records of abortion and dystocia during the period of 20 years from 1995-2014. The incidence of calving abnormalities such as abortion and dystocia were calculated as percentage for each period, season, parity, stage of lactation and level of production. Results:The incidence of calving abnormalities was 8.53 per cent while the incidence of abortion and dystocia was 5.81 and 2.3 per cent.The incidence of abortion was higher during summer season (7.61 per cent) while that of dystocia in rainy season (3.00 per cent).The highest incidence of abortion was observed in fourth parity in case of abortion (10.86 per cent) and dystocia (3.37 per cent). Conclusion: Non-genetic factors such as season, party, late stage of lactation and very high milk producing cows are predisposing factors for more occurrence of calving abnormalities in Phule Triveni crossbred cows, so more emphasis should be given to managemental practices to minimise the occurrence of incidence at farm level.

Breed effects and heterosis for productivity traits at first calving of Angus, Holstein Friesian, Jersey and crossbred beef cows

2014 ◽  
Vol 54 (9) ◽  
pp. 1381 ◽  
Author(s):  
R. E. Hickson ◽  
N. Lopez-Villalobos ◽  
P. R. Kenyon ◽  
S. T. Morris
Keyword(s):  
Dairy Cows ◽  
Reproductive Performance ◽  
Beef Cows ◽  
Milk Intake ◽  
The Other ◽  
Weaning Weight ◽  
Crossbred Cows ◽  
Beef Cow ◽  
Holstein Friesian ◽  
Positive Heterosis

Feed requirements for maintenance contribute a large proportion of the feed requirements of a beef cow so lighter cows may be more efficient producers of weaned calves, provided that such cows do not result in a comparative reduction in calf weaning weight. Beef-cross-dairy cows have increased milk yield compared with straight-bred beef cows and have the potential to wean heavier calves. Crossbred cows may also offer potential increases in production through heterosis. This experiment examined the performance of straight-bred Angus (AA), Holstein Friesian (FF) and Jersey (JJ) cows and of Angus-sired F1 crossbreds with Holstein Friesian (AF), Jersey (AJ) and Holstein Friesian-cross-Jersey (Kiwicross; AK) cows to identify breed and heterosis effects on milk intake and liveweight of calves and liveweight, reproductive performance and fatness of cows in their first lactation. Days to calving and weaning rate from first joining were similar among genotypes, but only 50% of FF cows conceived to second joining, compared with 90–98% for the other genotypes (P < 0.05). Estimated milk intake of calves was least (P < 0.05) for calves born to AA cows, and was generally similar (P > 0.05) among calves born to crossbred cows. There were positive heterosis effects between Angus and Jersey and between Angus and Holstein Friesian on milk intake of the calf. Straight-bred FF cows weaned the heaviest calves (least-squares mean + s.e.: 241 ± 5 kg; P < 0.05). Calves born to AF and AK cows were weaned at similar liveweight (229 ± 3 kg and 226 ± 4 kg, respectively; P > 0.05), and were heavier (P < 0.05) than calves born to JJ and AJ cows, which were similar (208 ± 5 kg and 215 ± 3 kg, respectively; P > 0.05). Calves born to AA cows were lightest at weaning (196 ± 3 kg; P < 0.05). Estimates of heterosis for weaning weight were 11 ± 4 kg (P < 0.01) between Angus and Holstein Friesian, and 14 ± 4 kg (P < 0.001) between Angus and Jersey. Angus-cross-dairy cows offered production advantages over straight-bred AA cows as dam lines in a terminal cross. These advantages were partially due to heterosis.

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