caa a22 4500 386319936 CHVBK 20180307111622.0 cr unu---uuuuu 161130e198810 xx s 000 0 eng 10.1017/S0003356100003275 doi S0003356100003275 pii (NATIONALLICENCE)cambridge-10.1017/S0003356100003275 Modelling lactation curves of Friesian cows in a subtropical climate [Elektronische Daten] Monthly herd recording data from Friesian cows in south-east Queensland are used to evaluate 20 models of the lactation curve, 10 being drawn from the literature and 10 being original. The curve of Wood (1967) with equation y =a nb exp(-cn),and its modificationy =a nfc/cosh(en), generally gave the lowest values for the error mean square across all seasons of calving. However, the model which predicts a constant initial yield, followed by a linear decline,y =a forn =Sc, y =a - b(n -c) forn > c, is as good as the previous two models for winter calving cows. Hence it is a useful representation of the lactation curve in south-eastern Queensland, where about 40% of cows are calved in winter. The inverse polynomial modely =nl(a +bn + en2) is a useful model for lactations commencing in the summer months. Copyright © British Society of Animal Science 1988 Papajcsik I. A. Division of Australian Environmental Studies, Griffith University, Nathan, Queensland 4111, Australia Bodero J. Division of Australian Environmental Studies, Griffith University, Nathan, Queensland 4111, Australia Animal Production Cambridge University Press 47/2(1988-10), 201-207 0003-3561 47:2<201 1988 47 ASC https://doi.org/10.1017/S0003356100003275 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1017/S0003356100003275 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Papajcsik I. A. Division of Australian Environmental Studies, Griffith University, Nathan, Queensland 4111, Australia NATIONALLICENCE 700 1- Bodero J. Division of Australian Environmental Studies, Griffith University, Nathan, Queensland 4111, Australia NATIONALLICENCE 773 0- Animal Production Cambridge University Press 47/2(1988-10), 201-207 0003-3561 47:2<201 1988 47 ASC CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge