Theses and Dissertations Collection

Permanent URI for this collectionhttp://10.10.97.169:4000/handle/123456789/118

Browse

Browsing Theses and Dissertations Collection by Subject "Calving interval"

Now showing 1 - 2 of 2
  • Thumbnail Image
    Item
    Productive and reproductive performance of Friesian cows at Kitulo livestock multiplication unit, Tanzania
    (Tanzania Veterinary Journal, 2015-02-12) Kashoma, I. P.; Mwingira, S. M.; Werema, C. W.; Kessy, B. M.
    Retrospective data were collected to assess reproductive and productive performance of Friesian dairy cows reared at Kitulo Livestock Multiplication Unit, Tanzania. Records of 314 cows within consecutive five productive periods; 2009 - 2014 were analyzed using Statistical Package for SocialScience (SPSS). The overall mean age at first calving (AFC), calving interval (CI), days open (DO), number of services per conception (NSPC), lactation length (LL) and total lactation milk yield (TLMY) were 1151.72±9.63 days, 404.57±1.54 days, 121.82±1.24 days,1.83±0.24, 306.54±5.53 days and 5,042.12±23.73 kg, respectively. CI differed significantly (P < 0.05) as it decreased with increasing parity but did not affect the TLMY. Number of services per conception positively correlated with DO and CI but negatively correlated with parity. Total lactation milk yield was significantly (P < 0.05) influenced by parity and lactation length, but TLMY had no significant (P > 0.05) effect on the average number of services per conception. It is concluded that reproductive and productive performance of Friesian dairy cows in the present study were low to moderate so it is required to improve management practices at the farm for better reproductive and productive performance.
  • Thumbnail Image
    Item
    Reproductive and productive performance of crossbred dairy cows kept in different production systems in Morogoro municipality, Tanzania
    (Tanzania Veterinary Journal, 2015-08-25) Ngou, A. A.; Kashoma, I. P.
    Crossbred cows are the main type of cattle used for milk production on smallholder and medium farms in urban and peri-urban areas of Morogoro Municipality. A study was undertaken on four medium-scale and forty five smallholder farms to investigate the reproductive and productive performance of crossbred maintained under farmer’s management. Retrospective data on age at first calving (AFC), calving interval (CI), days open (DO), number of service per conception (NSC), lactation length (LL) and total lactation milk yield (TLMY) obtained from 311 cows for lactations (1-6) during seven years (2009-2015) were analyzed. Overall mean of AFC, CI, NSC, DO, LL and TLMY were 30.9 ± 0.8 months, 405±15.4 days, 2.5 ± 0.6 numbers, 119 ± 15.9 days, 333 ± 26.7 days and 4026 ± 1158 liters, respectively. The results of all traits showed variation between the two production systems (medium-scale versus smallholder farms). However, AFC, CI and TLMY parameters only differed among the medium-scale farms. It is concluded that reproductive and productive performance of crossbred cows in the present study were low to moderate so, it is required to improve management practices atall the farms under the study for better reproductive and productive performance.