Anogenital distance (AGD), defined as the from center of anus to base clitoris, in lactating dairy cows first and second parity, has been reported be inversely related fertility moderately heritable. Thus, AGD may a useful reproductive phenotype for future genetic selection improve fertility. The objectives this study were (1) characterize nulliparous heifers; (2) determine if inverse relations...

Full signalling of oestrous behaviour is vital for proper timing of AI and good reproductive performance, currently jeopardized by shorter observations of oestrus behaviour. Alternative indicators including progesterone (P(4)) recordings on-farm are tested. Oestrous intensity of 37 heifers (H) and 30 1st-parity dairy cows (C(1)) either Swedish Red (32) or Swedish Holstein (35) with high genetic...

Mastitis is a common infectious disease in dairy cattle, and is among the most economically damaging animal health problem producers face. Mastitis in dairy heifers is recognised as a distinct problem from that in older cows because of the different pattern of disease (Barkema, Schukken et al. 999; Valde, Lawson et al. 004) and unique factors that determine its occurrence (Waage, Sviland et al....

this prospective longitudinal study deals with the associations between digital disorders and reproduction indices in dairy cattle on a farm in the vicinity of tehran. it was carried out on 225 postparturient holstein heifers. the evaluation of lameness due to digital disorders on postpartum period of heifers were done and after diagnosis of lameness (based on a 5 points lameness scoring system...

objective of the present study was to determine calving parameters in eighteen large dairy herds of holstein friesian in tabriz. data analysis showed that the mean gestations length were 276.69 ± 6.29, 279.54 ± 8.55 and 271.38 ± 7.34 days in multipara cows and twining pregnancy respectively. percent of premature birth were 24.14% in twining (28 cases out of in 116 births), 9.61% in heifers (114...

An outbreak of Staphylococcus aureus intramammary infections on an organic dairy farm was monitored for 10 months. Environmental and milk samples were collected from a total of 26 cows and a group of 21 purchased heifers about to be introduced into the milking herd. There was variation in the rate of isolation of S. aureus (9.5 to 43.8%) from individual mammary quarters, although no S. aureus i...