Pakistan Journal of Biological Sciences1028-88801812-5735Asian Network for Scientific Information10.3923/pjbs.2008.1047.1050MohamadniaA.R. MohamaddoustM. ShamsN. KheiriS. SharifiS. 72008117In this current study, prevalence of lameness was detected and its
changes during different parities, Days in Milk (DIM) and milk production
were studies. In addition, effects of lameness on Open Days (OD) and Service
per Conception (S/C) were studied. Three dairy farms on three scales (1:
Large, approximately 900 milking cows, 2: Medium, approximately 100 milking
cows and 3: Small, approximately 20 milking cows) were watched for lameness
in 2005-2006. Locomotion Scoring (LS) by Sprecher method (1-5 point scale)
has been done by videoing of the animals at the exit of the milking parlor.
Videos were reviewed by two expert and mean of the each score used as
score of the animal, cows with scores 1 and 2 recorded as non-lame and
3, 4 and 5 as lame cows. The average score of the lameness in autumn and
spring recorded as 2.47 and 2.73, respectively that was higher significantly
in spring. LS has been increased significantly by increasing parity and
DIM, as highest scores were recorded in parity 4 and DIM 240-300. No significant
differences between lame and non-lame cows were recorded in according
to their milk production. The highest (percent in lame cows) scores were
recorded in high producing cows. No significant difference in milk production
has been recorded in different LS. However the average production of milk
in lame cows were 1.08 L day-1 less that non-lame cows. The
average OD of the lame cows was significantly longer (52 days) than non-lame
cows. Lame cows needed significantly higher service/conception (one) than
non-lame cows. Median of OD and S/C has been increased by LS.]]>Clarkson, M.J.,1996138563567Collick, D.W., W.R. Ward and H. Dobson,1989125103106Fault, W.B.,1996139130136Hassall, S.A.,1993132578580Hernandez, J., J.K. Shearer and D.W. Webb,200121816111614Hernandez, J.A., E.J. Garbarino, J.K. Shearer, C.A. Risco and W.W. Thatcher, 200522712921296Hernandez, J.A.,200522712841291Laven, R.A. and K.R. Lawrence,20068938583865Logue, D.N., D. McNully and A.M. Nolan,199815656Lucey, S., G.J. Rowlands and A.M. Russell,1986118628631Mill, J.M. and W.R. Ward,1994134162164Mohamadnia, A.R.,20062006pp: 138150Nordlund, K.V.,2004872735Offer, J.E.,2000147105109Pedro, M. and B. Julian,20022002pp: 339342Radostits, O.M.,20013rd Edn.,pp: 492-499pp: 492-499Rowlands, G.J., A.M. Russell and L.A. Williams,1985117576580Scott, P.R.,19961521112Sogstad, A.M., T. Fjeldaas and O. Osteras,200546203217Sprecher, D.J., D.E. Hostetler and J.B. Kaneene,19974711791187Vaarst, M., J. Hindhede and C. Enevoldsen,199865175186Weaver, A.D., G.S. Jean and A. Steiner,20052nd Edn.,pp: 198-258pp: 198-258Wells, S.J., A.M. Trent and W.T. Marsh,19932027882Wells, S.J., A.M. Trent, W.E. Marsh, N.B. Williamson and R.A. Robinson,1995136537540Whey, H.,200224444449Whitaker, D.A., J.M. and Smith, E.J.,19831136062