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LEVEL OF INBREEDING IN JERSEY COWS IN PUNJAB  [cached]
Riaz Hussain Mirza, Abdul Sattar and Khalid Javed
Pakistan Veterinary Journal , 2002,
Abstract: Pedigree, breeding and performance records of the purebred Jersey herd maintained at the Livestock Experiment Station, Bhunikey (Pattoki) Kasur during the period 1982-2000 were utilized for the present study. The coefficient of inbreeding of each animal was calculated using Derivative Free Restricted Maximum Likelihood (DFREML) set of computer programme. Analysis of pedigree records of 602 animals having identification for the extent of inbreeding revealed that only 13 animals (2.16%) were inbred with an average inbreeding coefficient of 24%, the highest level being 25%. Overall average inbreeding coefficient was found to be only 0.0043%. None of the 36 sires used was found inbred. One of the main reasons for low level of inbreeding in the present herd was comparatively shorter time period and the incomplete pedigrees especially for animals born in earlier years. It was concluded that level of inbreeding might increase in future, therefore precise pedigree recording and planned mating strategies be adopted to avoid any adverse effect of inbreeding on performance traits.
MILK PRODUCTION POTENTIAL OF PURE BRED HOLSTEIN FRIESIAN AND JERSEY COWS IN SUBTROPICAL ENVIRONMENT OF PAKISTAN
M. LATEEF, K. Z. GONDAL, M. YOUNAS, M. SARWAR, M. I. MUSTAFA AND M. K. BASHIR1
Pakistan Veterinary Journal , 2008,
Abstract: The data on 575 records of 270 Holstein Friesian and 818 records of 326 Jersey cows maintained in Punjab, Pakistan were analyzed. The cows were grouped into imported Holstein Friesian, imported Jersey, Farm born Holstein Friesian and farm born Jersey cows. Lactation milk yield of farm born Holstein Friesian and Jersey cows was significantly (P<0.05) lower than that of imported Holstein Friesian and Jersey cows. Breed group, season of calving and lactation number had significant (P<0.05) effect on lactation milk yield. The highest lactation milk yield was observed in imported and farm born Holstein Friesian cows calved during autumn, while in imported Jersey cows maximum lactation milk yield was observed in cows calved during spring season. The maximum lactation milk yield was observed in the third lactation in imported Holstein Friesian, imported Jersey and farm born Holstein Friesian cows, while in farm born Jersey cows maximum lactation milk yield was observed in the fifth lactation. The milk yield in all breed groups increased with increase in lactation length and service period.
Productive and Reproductive Efficiency of Imported and Local Born Jersey Breed of Cattle in the Subtropical Environment of Pakistan
Intizar Ali,Riaz Hussain Mirza,Azam Ali Nasir
Pakistan Journal of Biological Sciences , 1999,
Abstract: Data concerning productive and reproductive traits, was collected from 1985-91 and analyzed. The analysis, for local born Jersey and imported Jersey cows, revealed that the, age at first calving average 771.48 ±7.88 and 800.51 ±8.48 days, services per conception were 1.83 ±0.069 and 1.88 ±0.072, services period was 100.99 ±4.63 and 107.03 ±2.77 days, gestation period was observed to be 279.26 ±0.51 and 277.49 ±0.36 days and was longer in cows carrying male calves than those carrying female calves; calving interval averaged 380.93 ±6.36 and 387.18 ±0.3 days, local jersey cows showing shorter calving interval than imported jersey but non-significant, 305-days milk production average 2194.52 ±57.24 and 3150.48 ±46.18 litters, showing that local born Jersey group produced less milk than their imported dams and results were highly significant, dry period was found to be 157.91 ±9.70 and 133.30 ±5.77 days respectively. Whereas the effect of season of birth on age at first calving was found to be non significant.
Study on the reproductive performance of Jersey cows at Wolaita Sodo dairy farm, Southern Ethiopia
H Lemma, K Belihu, D Sheferaw3
Ethiopian Veterinary Journal , 2010,
Abstract: Retrospective study was conducted in Wolaita Sodo State Dairy Farm, Southern Ethiopia, to assess the reproductive performance and herd life of Jersey cattle, and the associated factors. The study breed was mainly kept in the farm on pastureland and with some supplementary feeds. The results revealed an overall mean of age at first service, age at first calving, calving interval, interval between calving and effective service and number of services per conception of 722.24 days (SE=36.4), 1035.21 days (SE=12.59), 450.09 days (SE=6.60), 174.68 days (SE=8.61) and 1.79 (SE=0.06) respectively. All the traits were significantly influenced by year of birth (p<0.001). Age at first service was significantly lower in imported cattle while calving interval was lower in on-farm raised cattle (p<0.001). Calving interval and the interval between calving and effective service were decreasing significantly with parity number (p<0.001). Number of services per conception was significantly lower in short rainy season (p<0.05). The mean length of the herd life, productive herd life and effective productive herd life were 2983.74 days (SE=67.98), 2310.11 days (SE=296.91) and 1663.15 days (SE=55.09), respectively. Year of birth had significant effect on herd life (p<0.001) and effective productive herd life (p<0.01). Imported cattle had significantly longer herd life (p<0.01) and productive herd life (p<0.05) than the on-farm reared animals. The mean birth and weaning weights were 22.87 kg (SE=0.17) and 108.88 kg (SE=0.67) respectively. Both traits were influenced significantly by year and season of birth, sex of calves and parity of the dam (p<0.01). Calves born in the long rainy season had better birth and weaning weight than the others. There was a trend of increased birth weight of calves as the parity number of the dam increased.
EFFECT OF PREPARTUM TREATMENT OF VITAMIN E-SELENIUM ON POSTPARTUM REPRODUCTIVE AND PRODUCTIVE PERFORMANCE OF EXOTIC COWS AND THEIR CALVES UNDER SUBTROPICAL CONDITIONS  [PDF]
A. SATTAR, R. H. MIRZA1 AND S. M. I. HUSSAIN2
Pakistan Veterinary Journal , 2007,
Abstract: This study was carried out at the Livestock Experiment Station, Bhunikey (Pattoki), District Kasur, Pakistan. Forty exotic cows (20 each of Holstein Friesian and Jersey breed) in their last trimester of pregnancy were randomly selected. These cows were divided into two equal groups. Animals of group-I served as control and were injected with 20 ml sterile normal saline intramuscularly, while each cow in group-II was treated with vitamin E-selenium (vitamin E acetate 50.0 mg and sodium selenite 0.5 mg/ml) twice (20 ml at each time) with one-week interval. First injection was given at about 40-60 days prior to the expected date of calving. Calves born to the experimental cows were monitored to study the carry over effect of treatment, if any, from dams to the calves. The reproductive parameters, viz. placental expulsion period, uterine involution period, postpartum insemination interval, service period and number of services per conception in the cows of treated group were significantly (P<0.05) lesser compared with those of the control group. However, the differences in production parameters, i.e., lactation milk yield, lactation length and wet average between the two groups were statistically non significant. The same was true for birth weight, weaning weight and growth rate upto weaning between calves of the two groups. In conclusion, it appears that administration of vitamin E-selenium before calving may be beneficial in improving the postpartum reproductive parameters in exotic cows. However, number of animals used in each group was too small to draw any definite conclusion.
Reproductive Problems of Cows at Bangladesh Agricultural University Dairy Farm and Possible Remedies  [PDF]
M.A.S. Talukder,M.A.M.Y. Khandoker,M.G.M. Rahman,M.R. Islam
Pakistan Journal of Biological Sciences , 2005,
Abstract: The reproductive disorders are major causes of reduced fertility in cows that result in failure to produce or delay in producing the total annual calf crop. To identify the reproductive problems of dairy cows of Bangladesh Agriculture University (BAU) dairy farm initially different reproductive parameters in five genetic groups of cows were compiled in this study and 10 cows were identified as less performer. Jersey cross and Holstein Friesian cross were found as the less performer (30% reproductive disorder) followed by Sindhi and Sahiwal crossbred cows (20% reproductive disorder) and Red Chittagong was found as the best performer (0% reproductive disorder). The reproductive records of these 10 cows further taken into consideration and found to be anestrus. The cause of anestrus were further confirmed by rectal palpation and led to the anestrus due to unknown reason (20%) and ovarian abnormalities (80%). The ovarian abnormalities recorded to be as hypoplasia, deformed ovaries and cystic ovaries and their incidence percentages were 30, 20 and 30, respectively. For probable remedies related reproduction management were provided and the incidence (%) of improvement found in Jersey, Sindhi, Holstein Friesian and Sahiwal crossbreds cows were 66.7, 0.0, 33.3 and 100.0, respectively. It is concluded that Red Chittagong cows encountered least reproductive complains in BAU dairy farm. Moreover, Jersey and Holstein-Friesian crosses were found to be more susceptible to reproductive disorders than crosses of Sindhi and Sahiwal cows.
Estimates of repeatability and heritability of productive and reproductive traits in a herd of Jersey cattle
Roman, R.M.;Wilcox, C.J.;Martin, F.G.;
Genetics and Molecular Biology , 2000, DOI: 10.1590/S1415-47572000000100021
Abstract: estimates of the repeatability and heritability of 19 measures of performance in jersey cows were obtained using an animal model with a relationship matrix and a derivative-free restricted maximum likelihood algorithm. the data consisted of 935 records for 374 cows by 69 sires over the period 1969-1987. the estimates were similar to those obtained by ordinary least squares methods reported for the same data set and in other studies, but had smaller error variances. a likelihood ratio test showed agreement between these heritability estimates and those in the literature. the heritability estimates of milk, fat, protein, lactose-mineral, solids-not-fat, and total solids yields were about 0.25; for the corresponding percentages, and for the protein to fat and solids-not-fat to fat ratios, the estimates were 0.50. heritability estimates were 0.10 or less for the time from parturition to first breeding and for three measures of somatic cell counts. these estimates of heritability in a dairy cattle population in a subtropical environment were not different from those of populations in temperate climates.
Estimates of repeatability and heritability of productive and reproductive traits in a herd of Jersey cattle
Roman R.M.,Wilcox C.J.,Martin F.G.
Genetics and Molecular Biology , 2000,
Abstract: Estimates of the repeatability and heritability of 19 measures of performance in Jersey cows were obtained using an animal model with a relationship matrix and a derivative-free restricted maximum likelihood algorithm. The data consisted of 935 records for 374 cows by 69 sires over the period 1969-1987. The estimates were similar to those obtained by ordinary least squares methods reported for the same data set and in other studies, but had smaller error variances. A likelihood ratio test showed agreement between these heritability estimates and those in the literature. The heritability estimates of milk, fat, protein, lactose-mineral, solids-not-fat, and total solids yields were about 0.25; for the corresponding percentages, and for the protein to fat and solids-not-fat to fat ratios, the estimates were 0.50. Heritability estimates were 0.10 or less for the time from parturition to first breeding and for three measures of somatic cell counts. These estimates of heritability in a dairy cattle population in a subtropical environment were not different from those of populations in temperate climates.
Effect of Different Genotypes on Milk Yield and Reproductive Performance of Cows  [PDF]
M. S. U. Talukder,M.N. Haque,M.I. Hossain,S. A. Aziz
Pakistan Journal of Biological Sciences , 2001,
Abstract: The study was designed to evaluate the suitable genotype for increasing milk yield with satisfactory reproductive performance in local environmental and managemental conditions. Data from a local private dairy farm on milk yield and different reproductive traits of cows were made available in this study to evaluate the effects of different genotypes on lactation length, milk yield, length of dry period, service per conception, gestation length and post-partum heat period. Statistical analysis of the results indicated that milk yield, length of dry period, service per conception and post-partum heat period were significantly affected (P<0.01) by different genotypes. Lactation length and service per conception were also significantly affected (P<0.01) by parity and interaction of genotype x parity. The highest lactation length was observed for the genotype Jersey x Friesian x Local (JxFxL) and the lowest for Local (L) and Jersey x Local (JxL) in the first and second lactation. The highest milk yield was observed for the genotype JxF and JxFxL and lowest for L and JxL. The highest length of dry period was observed in L and lowest for JxL and JxFxL. Maximum services were required for L and JxFxL and lowest for JxL and Sahiwal x Local (SLxL.) The highest gestation length was observed for genotype SLxL and L, while the lowest for JxF and JxL. The highest post-partum heat period was observed for genotype JxL and JxFxL and lowest for L in pooled lactation. The milk yield of all the crossbred cows showed 16 to 58 per cent higher milk yield than indigenous cows (541.26 kg/lactation). The overall reproductive performance of different genotypes so far included in this study were not very different.
Milk quality of Jersey cows kept on winter pasture supplemented or not with concentrate
Gonzalez, Helenice de Lima;Velho, Ione Maria Pereira Haygert;Silva, Marcelo Abreu da;Medeiros, Renato Borges de;Paim, Nilton Rodrigues;N?rnberg, José Laerte;
Revista Brasileira de Zootecnia , 2009, DOI: 10.1590/S1516-35982009001000018
Abstract: this study was carried out to evaluate the effect of the use of supplementation in pasture cultivated with avena strigosa (black oats), lolium multiflorum (ryegrass) and vicia sativa l. (common vetch) on the composition and somatic cells count (scc) of jersey cow milk. eight cows of the jersey breed were separated by milk production, lactation period and live weight and were randomly blocked into two homogeneous groups (one with supplementation and other only on pasture), in a randomized complete design. both groups were allowed to pasture for about 7 hours per day in a rotational grazing system in strips, with a one-day occupation period. the supplemented group was fed daily with 8 kg of supplement made of soy bean meal, soy shells, calcium limestone and mineral salt. the results showed significant differences between the two groups, because the percentage of total solids, protein and milk fat were higher in the supplemented cows. the lactose percentage was not influenced by the supplement intake. the somatic cell count, although there was a lower statistical difference for the group on pasture, showed small numerical oscillation between the groups and therefore should not be considered an effect of supplementation. the supplement supply to jersey cows during lactation caused an increase in the total milk solid percentage, because it raised the fat and protein concentration.
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