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2007
Effect of divergent selection for wool bulk on live weight and wool characteristics in Perendale sheep, RMW, Sumner, JN Clarke, and NG Cullen , Proceedings of the New Zealand Society of Animal Production, Jan, Volume 67, Wanaka, p.180-186, (2007)
2006
Effect on fleece weight of combining genes from four flocks independently selected for increased fleece weight, RMW, Sumner, JN Clarke, HT Blair, NG Cullen, and HV Henderson , Proceedings of the New Zealand Society of Animal Production, Jan, Volume 66, Napier, p.195-199, (2006)
Variation in the New Zealand ram breeding industry ? results from the Poukawa progeny test, PD, Muir, BC Thomson, NB Smith, and JN Clarke , Proceedings of the New Zealand Society of Animal Production, Jan, Volume 66, Napier, p.373-376, (2006)
Variation in the New Zealand ram breeding industry û results from the Poukawa progeny test, PD, Muir, BC Thomson, NB Smith, and JN Clarke , Proceedings of the New Zealand Society of Animal Production, Jan, Volume 66, Napier, p.373-376, (2006)
2003
The benefits of across-flock analysis, JN, Clarke , Proceedings of the New Zealand Society of Animal Production, Jan, Volume 63, Queenstown, p.204-208, (2003)
2000
The benefits of sheep recording schemes for genetic research, JN, Clarke, and DJ Garrick , Proceedings of the New Zealand Society of Animal Production, Jan, Volume 60, Hamilton, p.198-202, (2000)
Genetic parameters for improvement of dual-purpose flock productivity with constraints on mature ewe body weight, JN, Clarke, JL Dobbie, KR Jones, AL Wrigglesworth, and SM Hickey , Proceedings of the New Zealand Society of Animal Production, Jan, Volume 60, Hamilton, p.203-206, (2000)
The Sheep Improvement Limited (SIL) genetic engine, SA, Newman, KG Dodds, JN Clarke, DJ Garrick, and JC McEwan , Proceedings of the New Zealand Society of Animal Production, Jan, Volume 60, Hamilton, p.195-197, (2000)
Sheep industry structure and genetic improvement, DJ, Garrick, HT Blair, and JN Clarke , Proceedings of the New Zealand Society of Animal Production, Jan, Volume 60, Hamilton, p.175-179, (2000)
1999
Discriminating among animals for improved rewards from traditional meat cuts, NB, Jopson, and JN Clarke , Proceedings of the New Zealand Society of Animal Production, Jan, Volume 59, p.269-271, (1999)
Genetic effects in GrowBulk sheep, JN, Clarke, RMW Sumner, and NG Cullen , Proceedings of the New Zealand Society of Animal Production, Jan, Volume 59, p.14-16, (1999)
Sex and age effects on genetic parameters for wool production and qualities, JN, Clarke, JL Dobbie, KR Jones, AL Wrigglesworth, and SM Hickey , Proceedings of the New Zealand Society of Animal Production, Jan, Volume 59, p.23-26, (1999)
1998
Genetic parameters for liveweight and live animal ultra-sound fat and eye muscle dimension in a synthetic terminal sire breed, JN, Clarke, GB Nicoll, and CM Mowat , Proceedings of the New Zealand Society of Animal Production, Jan, Volume 58, p.140-142, (1998)
Techniques for extraction of proteins for enzymatic measurements from ram spermatozoa and sheep muscle, GC, Upreti, JE Oliver, AG Clarke, JN Clarke, and JF Smith , Proceedings of the New Zealand Society of Animal Production, Jan, Volume 58, p.19, (1998)
1997
Comparison of weight-selected Romney hoggets for growth and ultrasonic fat and eye muscle dimensions., JN, Clarke, JL Dobbie, KR Jones, AE Uljee, and AL Wrigglesworth , Proceedings of the New Zealand Society of Animal Production, Jan, Volume 57, p.263-266, (1997)
Cost-benefit analysis of ultrasound scanning in meat breed ram breeding flocks., DB, Binnie, JN Clarke, and AL Rae , Proceedings of the New Zealand Society of Animal Production, Jan, Volume 57, p.260-262, (1997)
Muscle distribution in lamb progeny from several breeds., AH, Kirton, DM Duganzich, GJK Mercer, JN Clarke, JL Dobbie, and JA Wilson , Proceedings of the New Zealand Society of Animal Production, Jan, Volume 57, p.267-270, (1997)
1996
Genetic improvement of meat quality in sheep and cattle, JN, Clarke, CA Morris, PA Speck, GC Upreti, and GB Nicoll , Proceedings of the New Zealand Society of Animal Production, Jan, Volume 56, p.157-162, (1996)
Quality Meats From The NZ Beef And Sheep Industries - Consistent quality meat products, PA, Speck, AH Kirton, and JN Clarke , Proceedings of the New Zealand Society of Animal Production, Jan, Volume 56, p.146, (1996)
Repeatabilities of blood plasma metabolites and their associations with leanness in genotypes showing a wide divergence in carcass composition, JN, Clarke, DB Binnie, JL Dobbie, KR Jones, CM Mowat, RW Purchas, and AE Uljee , Proceedings of the New Zealand Society of Animal Production, Jan, Volume 56, p.180-183, (1996)
1995
Effects of genotype and nutrition on sheep carcass fat and eye muscle development between weaning and 14 months of age, DB, Binnie, JN Clarke, JB Clayton, CM Mowat, and RW Purchas , Proceedings of the New Zealand Society of Animal Production, Jan, Volume 55, p.104-107, (1995)
Evaluation of muscling using Texel and Oxford cross Romney and Hight Romney lambs, AH, Kirton, GJK Mercer, JN Clarke, JL Dobbie, DM Duganzich, and JA Wilson , Proceedings of the New Zealand Society of Animal Production, Jan, Volume 55, p.108-110, (1995)
Genetic parameters of lifetime wool production, JN, Clarke, JL Dobbie, SM Hickey, KR Jones, and AL Wrigglesworth , Proceedings of the New Zealand Society of Animal Production, Jan, Volume 55, p.268-271, (1995)
New sheep - a catalyst for change, JN, Clarke , Proceedings of the New Zealand Society of Animal Production, Jan, Volume 55, p.318-320, (1995)
Sires for more valuable lambs, JC, McEwan, GH Davis, PF Fennessy, and JN Clarke , Proceedings of the New Zealand Society of Animal Production, Jan, Volume 55, p.324-326, (1995)
Ultrasonic scanning of lamb carcasses for non-destructive carcass quality measurements, DB, Binnie, RJ Farmer, and JN Clarke , Proceedings of the New Zealand Society of Animal Production, Jan, Volume 55, p.111-113, (1995)
1994
Repeatability of seasonal wool growth in Merino Sheep, RMW, Sumner, JN Clarke, AJ Pearson, and PM Speedy , Proceedings of the New Zealand Society of Animal Production, Jan, Volume 54, p.163-166, (1994)
1993
Heritability of ultrasonic fat and muscle depths in Romney sheep, JC, McEwan, JN Clarke, SM Hickey, and KJ Knowler , Proceedings of the New Zealand Society of Animal Production, Jan, Volume 53, p.347-350, (1993)
Plasma prolactin in Romney sheep selected for hogget fleece weight, JN, Clarke, AJ Pearson, RMW Sumner, DL Johnson, JL Dobbie, JE Wildermoth, and AL Wrigglesworth , Proceedings of the New Zealand Society of Animal Production, Jan, Volume 53, p.371-376, (1993)
1992
Comparison of growth, hogget fleece weight and reproductive traits of three sheep breeds from a flock selected for prolificacy and a Romney control flock, JC, McEwan, GH Davis, KG Dodds, PF Fennessy, JN Clarke, GD Bruce, and MG Hishon , Proceedings of the New Zealand Society of Animal Production, Jan, Volume 52, p.211-216, (1992)
Effect of selection for productive traits on internal parasite resistance in sheep, JC, McEwan, P Mason, RL Baker, JN Clarke, SM Hickey, and K Turner , Proceedings of the New Zealand Society of Animal Production, Jan, Volume 52, p.53-56, (1992)
Expected responses in carcass composition to selection for muscularity in sheep, DF, Waldron, JN Clarke, AL Rae, and EG Woods , Proceedings of the New Zealand Society of Animal Production, Jan, Volume 52, p.29-32, (1992)
The National Database for sheep genetic evaluation and research, DJ, Garrick, JN Clarke, and CF Callow , Proceedings of the New Zealand Society of Animal Production, Jan, Volume 52, p.121-124, (1992)
1991
Analysis of lamb schedules and relative economic values of lean and fat, DF, Waldron, JN Clarke, and AL Rae , Proceedings of the New Zealand Society of Animal Production, Jan, Volume 51, p.405-410, (1991)
Comparative wool production of Texel, Oxford Down, Finnish Landrace and Romney sheep, JL, Dobbie, RMW Sumner, JN Clarke, and PM Speedy , Proceedings of the New Zealand Society of Animal Production, Jan, Volume 51, p.303-308, (1991)
Computer software to increase the efficiency of the New Zealand sheep industry, DB, Binnie, JN Clarke, AC Cooke, DL Johnson, and AL Rae , Proceedings of the New Zealand Society of Animal Production, Jan, Volume 51, p.299-302, (1991)
Effect of selecting Perendale hoggets for loose wool bulk on fleece characteristics and wool end-product performance, RMW, Sumner, DC Maddever, and JN Clarke , Proceedings of the New Zealand Society of Animal Production, Jan, Volume 51, p.347-352, (1991)
Selection for lean and against fat in sheep, JN, Clarke, and AL Rae , Proceedings of the New Zealand Society of Animal Production, Jan, Volume 51, p.401-404, (1991)
1990
Comparison of growth and carcass traits of ram lambs of three breeds from a flock screened for prolificacy and a Romney control flock, JC, McEwan, GH Davis, KG Dodds, PF Fennessy, JN Clarke, and M Hishon , Proceedings of the New Zealand Society of Animal Production, Jan, Volume 50, p.397-402, (1990)
1989
Inheritance of loose wool bulk, RMW, Sumner, JN Clarke, and DL Johnson , Proceedings of the New Zealand Society of Animal Production, Jan, Volume 49, p.297-302, (1989)
Technical aspects of the Animalplan system, DL, Johnson, AL Rae, and JN Clarke , Proceedings of the New Zealand Society of Animal Production, Jan, Volume 49, p.197-202, (1989)
Ultrasonic fat depths in Romney lambs and hoggets from lines selected for different production traits, JC, McEwan, JN Clarke, MA Knowler, and M Wheeler , Proceedings of the New Zealand Society of Animal Production, Jan, Volume 49, p.113-120, (1989)
1988
Carcass composition of exotic sheep breeds, JN, Clarke, AC Parratt, IC Malthus, NC Amyes, AE Uljee, and EG Woods , Proceedings of the New Zealand Society of Animal Production, Jan, Volume 48, p.53-56, (1988)
Early growth and reproduction of exotic sheep breeds - a preliminary report, WH, McMillan, IC Malthus, JN Clarke, and NC Amyes , Proceedings of the New Zealand Society of Animal Production, Jan, Volume 48, p.49-52, (1988)
1987
Genetic variation among six strains of Romneys and Border Leicester and Coopworth crosses, RL, Baker, JN Clarke, HH Meyer, TG Harvey, and ML Bigham , Proceedings of the New Zealand Society of Animal Production, Jan, Volume 47, p.101-105, (1987)
1986
Further development of sheep recording in New Zealand, CF, Callow, JN Clarke, and AL Rae , Proceedings of the New Zealand Society of Animal Production, Jan, Volume 46, p.117-120, (1986)
Inheritance of foot and jaw abnormalities in sheep, RL, Baker, JN Clarke, TG Harvey, and HH Meyer , Proceedings of the New Zealand Society of Animal Production, Jan, Volume 46, p.93-100, (1986)
Repeatability of reproductive performance following active immunisation of ewes, JN, Clarke, JF Smith, and DL Johnson , Proceedings of the New Zealand Society of Animal Production, Jan, Volume 46, p.101-104, (1986)
1985
Implications of steroid immunisation for programmes of genetic improvement of sheep, JN, Clarke , Proceedings of the New Zealand Society of Animal Production, Jan, Volume 45, p.189-192, (1985)
Inheritance of loose wool bulk in Romney and Perendale sheep, ML, Bigham, RMW Sumner, JN Clarke, and DL Johnson , Proceedings of the New Zealand Society of Animal Production, Jan, Volume 45, p.213-216, (1985)
1984
Dressing percentages of lambs, AH, Kirton, AH Carter, JN Clarke, and DM Duganzich , Proceedings of the New Zealand Society of Animal Production, Jan, Volume 44, p.231-234, (1984)
The effects of lamb breed, slaughter age and sex on carcass fat depth and export grade, KG, Geenty, SR Young, JN Clarke, and JA Wilson , Proceedings of the New Zealand Society of Animal Production, Jan, Volume 44, p.227-230, (1984)
Expected selection responses in lamb carcass composition and weight, GL, Bennett, and JN Clarke , Proceedings of the New Zealand Society of Animal Production, Jan, Volume 44, p.243-248, (1984)
Relationship of subcutaneous fat depth and weight changes induced by stocking rate of 4 lines of lambs, GL, Bennett, JN Clarke, PV Rattray, and KS MacLean , Proceedings of the New Zealand Society of Animal Production, Jan, Volume 44, p.215-218, (1984)
Relative performance of meat breeds of sheep in New Zealand and overseas, JN, Clarke, GL Bennett, and AH Kirton , Proceedings of the New Zealand Society of Animal Production, Jan, Volume 44, p.239-242, (1984)
Selection for productive traits on back fat depth in ewe lambs, JC, McEwan, PF Fennessy, JN Clarke, SM Hickey, and MA Knowler , Proceedings of the New Zealand Society of Animal Production, Jan, Volume 44, p.249-252, (1984)
1983
Genetic variation in uterine efficiency and differential responses to increased ovulation rate in sheep, HH, Meyer, JN Clarke, TG Harvey, and IC Malthus , Proceedings of the New Zealand Society of Animal Production, Jan, Volume 43, p.201-204, (1983)
1982
A comparison of the composition and carcass quality of Kelly and Russian castrate, ram, wether and ewe lambs, AH, Kirton, JN Clarke, and SM Hickey , Proceedings of the New Zealand Society of Animal Production, Jan, Volume 42, p.117-118, (1982)
Effect of ewe ovulation rate and uterine efficiency on breed and strain variation in litter size, HH, Meyer, and JN Clarke , Proceedings of the New Zealand Society of Animal Production, Jan, Volume 42, p.33-36, (1982)
Evaluation of dam breeds and crosses for export lamb production, JN, Clarke, KD Atkins, KG Geenty, DL Johnson, SM Hickey, and JA Wilson , Proceedings of the New Zealand Society of Animal Production, Jan, Volume 42, p.133-136, (1982)
Level of nutrition of the ewe and lamb survival, DL, Johnson, JN Clarke, KS MacLean, EH Cox, NC Amyes, and PV Rattray , Proceedings of the New Zealand Society of Animal Production, Jan, Volume 42, p.13-14, (1982)
1981
Effect of mating Romney ewe hoggets on lifetime production - Preliminary results, RL, Baker, JN Clarke, and GD Diprose , Proceedings of the New Zealand Society of Animal Production, Jan, Volume 41, p.198-203, (1981)
1980
Liveweight variation in Sheeplan flocks, DL, Johnson, JN Clarke, and CA Robinson , Proceedings of the New Zealand Society of Animal Production, Jan, Volume 40, p.254-257, (1980)
1978
Genetic and environmental effects on incidence and causes of lamb mortality, HH, Meyer, and JN Clarke , Proceedings of the New Zealand Society of Animal Production, Jan, Volume 38, p.181-184, (1978)
1977
Breeding Objectives for New Zealand Sheep Production, CA, Morris, and JN Clarke , Proceedings of the New Zealand Society of Animal Production, Jan, Volume 37, p.182, (1977)
A comparison of sire and dam breeds for the production of export lambs slaughtered at 3, 4?, and 6 months of age, KG, Geenty, and JN Clarke , Proceedings of the New Zealand Society of Animal Production, Jan, Volume 37, p.235-242, (1977)
Reproductive performance, growth and wool production of exotic sheep and their crosses with the Romney, HH, Meyer, JN Clarke, ML Bigham, and AH Carter , Proceedings of the New Zealand Society of Animal Production, Jan, Volume 37, p.220-229, (1977)
Technical Aspects of the National Sheep Recording Scheme (Sheeplan), JN, Clarke, and AL Rae , Proceedings of the New Zealand Society of Animal Production, Jan, Volume 37, p.183-197, (1977)
1976
The effect of level of nutrition on the productivity of sheep of different genetic origin, JP, Joyce, JN Clarke, KS MacLean, RJ Lynch, and EH Cox , Proceedings of the New Zealand Society of Animal Production, Jan, Volume 36, p.170-178, (1976)
1975
Estimates of genetic variation and covariation from New Zealand National Board Performance Testing Data, JN, Clarke, JL Adam, and K Hargreaves , Proceedings of the New Zealand Society of Animal Production, Jan, Volume 35, p.151, (1975)
Relationships between milk yield, milk consumption and lamb growth in Romney, Dorset and Crossbred sheep, KG, Geenty, JN Clarke, DE Wright, GJ Wright, and BA Jones , Proceedings of the New Zealand Society of Animal Production, Jan, Volume 35, p.137, (1975)
1974
Comparison of pen and paddock systems for the pedigree mating of sheep, JN, Clarke, KG Geenty, RG Bennett, GN Christensen, and JA Wilson , Proceedings of the New Zealand Society of Animal Production, Jan, Volume 34, p.23-27, (1974)
Sources of variation for wool, body weight and oestrous characters in Romney hoggets, RL, Baker, JN Clarke, and AH Carter , Proceedings of the New Zealand Society of Animal Production, Jan, Volume 34, p.19-22, (1974)
1972
Current Levels of Performance in the Ruakura Fertility Flock of Romney Sheep, JN, Clarke , Proceedings of the New Zealand Society of Animal Production, Jan, Volume 32, p.99-111, (1972)
1971
Breeds of Sire for Export Lamb Production, AH, Kirton, AH Carter, JN Clarke, DP Sinclair, and KE Jury , Proceedings of the New Zealand Society of Animal Production, Jan, Volume 31, p.175, (1971)
Crossing Experiments for the Utilization of Sheep Breeds in New Zealand, JN, Clarke , Proceedings of the New Zealand Society of Animal Production, Jan, Volume 31, p.164-174, (1971)
1966
Hormonal synchronization of oestrus in Romney ewes during the breeding season, JN, Clarke, EM Roberts, AH Carter, and AH Kirton , Proceedings of the New Zealand Society of Animal Production, Jan, Volume 26, p.107-122, (1966)
1965
Extent and nature of weight losses due to pre-slaughter fasting of lambs, AH, Kirton, JN Clarke, AH Carter, and DP Sinclair , Proceedings of the New Zealand Society of Animal Production, Jan, Volume 25, p.184-194, (1965)