caa a22 4500 388059826 CHVBK 20180307125117.0 cr unu---uuuuu 161130e199806 xx s 000 0 eng 10.1017/S1357729800009140 doi S1357729800009140 pii (NATIONALLICENCE)cambridge-10.1017/S1357729800009140 Genetic parameters and evaluations for somatic cell counts and its relationship with production and type traits in some dairy breeds in the United Kingdom [Elektronische Daten] Somatic cell count (SCO data collected on individual cows since 1991 were obtained from National Milk Records. Following validation genetic and phenotypic parameters were estimated from the lactation average SCCfor 63 424 Holstein/Friesian (HOD, 7966 Ayrshire (AYR) and 14 509 Jersey (JER) animals. The first three lactations were included in the analyses. The heritabilities (h2) for first lactation log SCC (LSCC) were 0·11 (s.e. 0·01), 0·12 (s.e. 0·02) and 0·09 (s.e. 0·03) for the HOL, JER and AYR breeds respectively. Estimates for herd sire interaction (c2) effects ranged from 0·01 to 0·02. Analysis of the first three lactations with a repeatability model produced similar h2 and c2 estimates. Permanent environment estimates ranged from 0·21 to 0·25. Heritabilities of individual test day LSCC ranged from 0·04 (s.e. 0·02) to 0·10 (s.e. 0·03). Genetic correlations between SCC and milk, fat and protein yield for the HOL breed were 0·06 (s.e. 0·05), 0·14 (s.e. 0·06) and 0·09 (s.e. 0·06) respectively. Genetic evaluations were obtained for 666 595 and 9136 animals for Holsteins and Ayrshires, providing evaluations on 13 525 and 1713 bulls respectively in each breed. The range of LSCC predicted transmitting abilities (PTA) was ±25% although the proportion of bulls with reliability > 0·50 was low at 0·17 and 0-05 for HOL and AYR respectively. The correlations between the LSCC PTAs for HOL bulls with at least 50 daughters and their genetic evaluations for linear type were essentially zero for body and some udder traits. Significant negative correlations were obtained for a number of traits including foot angle (0·14), fore-udder attachment (0·19) and udder depth (0·19) and a positive correlation for teat length (0·15). SCC evaluations will be implemented by the Animal Data Centre. Reliabilities will be lower than production because of the lower h2 for SCC and the lower progeny group size since only 0·80 of recorded cows have SCC records. Copyright © British Society of Animal Science 1998 dairy cattle nationallicence genetic parameters nationallicence production nationallicence somatic cell count nationallicence Mrode R. A. Animal Data Centre Ltd, Fox Talbot House, Greenways Business Park, Chippenham SN15 1BN Swanson G. J. T. Animal Data Centre Ltd, Fox Talbot House, Greenways Business Park, Chippenham SN15 1BN Winters M. S. Cogent, Woodhouse Farm, Aldford, Chester CHS 6JD Animal Science Cambridge University Press 66/3(1998-06), 569-576 1357-7298 66:3<569 1998 66 ASC https://doi.org/10.1017/S1357729800009140 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1017/S1357729800009140 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Mrode R. A. Animal Data Centre Ltd, Fox Talbot House, Greenways Business Park, Chippenham SN15 1BN NATIONALLICENCE 700 1- Swanson G. J. T. Animal Data Centre Ltd, Fox Talbot House, Greenways Business Park, Chippenham SN15 1BN NATIONALLICENCE 700 1- Winters M. S. Cogent, Woodhouse Farm, Aldford, Chester CHS 6JD NATIONALLICENCE 773 0- Animal Science Cambridge University Press 66/3(1998-06), 569-576 1357-7298 66:3<569 1998 66 ASC CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge