@conference {41726,
	title = {Sperm DNA damage after scrotal insulation in rams},
	booktitle = {Proceedings of the New Zealand Society of Animal Production},
	volume = {67},
	year = {2007},
	month = {Jan},
	pages = {192-197},
	publisher = {New Zealand Society of Animal Production},
	organization = {New Zealand Society of Animal Production},
	address = {Wanaka},
	abstract = {Human male fertility is in decline and one reason given for this is the increased incidence of sperm showing chromosomal or DNA damage. Previous work in laboratory and farm animals as well as humans has shown that elevated testicular temperatures increases the incidence of sperm with DNA damage. As part of a study into the effect of temperature on mutation rate in spermatozoa using rams as a model, measurements of sperm DNA damage were also recorded. Twelve mature Dorset x Romney rams, were trained to AV semen collection. Scrotal insulation harnesses were applied (plastic bag with cotton wool insulation inside a rubberised fabric protection cover) to two groups of 6 rams for either a 24 or 48 hour period at day 0. Semen was collected on days -4 and 0 as control samples for each ram before treatment and days 3, 7, 10, 14, 17, 21, 24, 28, 31, 35, 38, 43, 45 and 49 post treatment. Semen was diluted in RSD-1 + TNE and snap frozen in liquid nitrogen. Samples were thawed and assessed by the Sperm Chromatin Structure Assay (SCSA) on the flow cytometer. This measures sperm susceptibility to {\textquoteleft}in situ{\textquoteright} acid denaturation by staining with acridine orange fluorochrome, which fluoresces differentially when binding to double stranded DNA (green) or single stranded DNA (red). The data indicate an increase in the percentage of sperm that have DNA damage, appearing about 21 days post treatment and reaching a maximum at 35 days. The proportion of sperm with moderate to highlevels of DNA damage was significantly (P<0.001) greater in the 48 hour treatment group and was still observed at 49 days while most of the 24 hour treated animals had recovered by this stage. Of particular interest was the shift of the entire sperm population, in DNA fragmentation index (ratio of red fluorescence:total (red + green) fluorescence), indicating increased susceptibility of DNA denaturation in all cells. This was accompanied by an increase in DNA stainability (increase of green fluorescence) which is interpreted asbeing due to an increase in the number of immature sperm cells with less compacted chromatin which results from abnormal or unprocessed protamines. The sperm damage seen after a relatively mild heat treatment indicates possible mechanisms for the adverse effects of modern life styles on male fertility.},
	issn = {1176-5283},
	author = {McDonald RM and Smith JF and Montgomery GW and Fleming JS and Cox NR}
}
@conference {41263,
	title = {The search for quantitative trait loci affecting wool colour},
	booktitle = {Proceedings of the New Zealand Society of Animal Production},
	volume = {61},
	year = {2001},
	month = {Jan},
	pages = {104-108},
	publisher = {New Zealand Society of Animal Production},
	organization = {New Zealand Society of Animal Production},
	address = {Christchurch},
	abstract = {Farmers have been attempting to breed whiter wool for some time using quantitative and subjective genetic selection based on phenotypic traits. The improvement of wool colour using this form of selection has achieved limited success. The advent of DNA marker maps has introduced the possibility of more directly relating phenotypic and genetic variation. Work presented here has identified a total of ten potential quantitative trait loci (QTL) that are significant at the suggestive level, and one additional QTL that approached this significance threshold that influence wool colour. There have been five putative QTL identified for base colour or challenge colour brightness. Two QTL affecting challenge colour yellowness was identified, while three QTL identified were linked to predictive colour variation. An additional QTL that affected predictive colour has also been mapped to a non-specific location on chromosome 24. Several further key areas of research need to be addressed before the DNA markers can be developed for use in the improvement of wool colour. },
	issn = {1176-5283},
	author = {McKenzie GW and Maher AP and Dodds KG and Beattie AE and Henry HM and Hickford JGH and Montgomery GW}
}
@conference {41046,
	title = {Wool follicle traits of half Merino half Romney F1 , and backcross three-quarters Merino quarter Romney gene mapping flocks},
	booktitle = {Proceedings of the New Zealand Society of Animal Production},
	volume = {58},
	year = {1998},
	month = {Jan},
	pages = {262-265},
	publisher = {New Zealand Society of Animal Production},
	organization = {New Zealand Society of Animal Production},
	abstract = {Wool follicle traits and mean fibre diameter (MFD) of {\textonehalf} Merino {\textonehalf} Romney F{\textonesuperior} (MR), and {\textthreequarters} Merino {\textonequarter} Romney backcross (MRM) were compared. Skin and midside samples were collected from 25 ewes and rams of MR and 420 MRM progeny. MRM was lower than MR for MFD by 3.0 mm, follicle fibre area (FFA) by 162.4 mm{\texttwosuperior}, and diameter (FFD) by 4.1 mm, but greater for total follicle density (DEN) by 21.7 mm-2 , primary density (PD) by 0.8 mm-2 , and secondary to primary ratio (SPR) by 4.8 units. Most traits had significant differences (P<0.05) for birth year, breed and sire group, but only PD and SPR were significant for sex and birth/rearing rank. FFD was positively correlated (P<0.001) with MFD (r = 0.22), and the relationship had a common slope of 0.7, but intercepts were significantly different (P<0.01) across birth years (i.e. 13.5, 12.0, and 10.9 mm for born 1991, 1992, and 1993). },
	issn = {1176-5283},
	author = {Andrews RN and Beattie AE and Dodds KG and Wuliji T and Montgomery GW}
}
@conference {40968,
	title = {Positional cloning to identify genes.},
	booktitle = {Proceedings of the New Zealand Society of Animal Production},
	volume = {57},
	year = {1997},
	month = {Jan},
	pages = {302-304},
	publisher = {New Zealand Society of Animal Production},
	organization = {New Zealand Society of Animal Production},
	abstract = {Target genes, identified by their phenotypic effect, can be located by positional cloning. Current genetic maps in livestock species lack the necessary detail for direct application in these projects. Fine maps of each target region must be developed using a variety of strategies. These include chromosome specific libraries and comparative mapping. A physical map of the region is generated by identifying overlapping clones containing large DNA inserts. All genes from the region are sought and candidate genes identified. The resources being developed in livestock projects, including the search for the Booroola (FecB) locus, and complete expression maps for the human genome will greatly facilitate future positional cloning projects in livestock. },
	issn = {1176-5283},
	author = {Montgomery GW and Lord EA and Lumsden JM}
}
@conference {40281,
	title = {DNA variation among seven New Zealand sheep breeds},
	booktitle = {Proceedings of the New Zealand Society of Animal Production},
	volume = {51},
	year = {1991},
	month = {Jan},
	pages = {47-54},
	publisher = {New Zealand Society of Animal Production},
	organization = {New Zealand Society of Animal Production},
	abstract = {Karyotype analysis, used for screening chromosomal anomalies in  humans and livestock, is being evaluated as a means of identifying sheep  carrying the Booroola fecundity gene. This has involved comparing the  chromosomes of metaphase spreads from animals heterozygous for the  Booroola gene (FecB+) to screen for numerical or physical abnormalities  between the chromosome pairs using Giemsa (GTG) banding. A number of  anomalies have been observed from 18 of 3 FecB+ rams and 4  FecB+ ewes. The anomalies were spread throughout most chromosomes, but  none were present in all karyotypes. No alteration in chromosome number  was observed. These preliminary results suggest that the Booroola  mutation is not the result of a major chromosomal alteration.  },
	issn = {1176-5283},
	author = {Sise JA and Montgomery GW and Hill DF}
}
@conference {40250,
	title = {The Booroola F gene is excluded from close genetic linkage with either the haemoglobin Beta or follicle stimulating hormone Beta loci},
	booktitle = {Proceedings of the New Zealand Society of Animal Production},
	volume = {50},
	year = {1990},
	month = {Jan},
	pages = {411-416},
	publisher = {New Zealand Society of Animal Production},
	organization = {New Zealand Society of Animal Production},
	abstract = {No abstract supplied   },
	issn = {1176-5283},
	author = {Montgomery GW and Tate ML and Sise JA and Hill DF}
}
@conference {40113,
	title = {Detecting inherited variation in DNA sequences and its application in animal science},
	booktitle = {Proceedings of the New Zealand Society of Animal Production},
	volume = {48},
	year = {1988},
	month = {Jan},
	pages = {171-180},
	publisher = {New Zealand Society of Animal Production},
	organization = {New Zealand Society of Animal Production},
	abstract = {A high fleece weight Romney ewe flock was established by selecting the top 0.6\% on greasy weight (GFW) from 32,000 hoggets (average selection differential 40\%). These ewes were mated in 1985 and 1986 by Romney rams with high positive deviations for GFW (selection differentials 48\% in 1985 and 57\% in 1986). Relative to random progeny, the high fleece weight progeny born in 1985 and 1986 had 0.66 kg (28\%) and 0.36 (12\%) higher mean GFWs, respectively. Estimates of realised heritability were 0.45 and 0.22 for the 1985 and 1986 born hoggets, respectively. Two sires used in 1985 had progeny distributions for GFW consistent with their having 1 copy of a single gene for GFW with an additive effect of approximately 1 kg. The single gene hypothesis is being examined by further progeny testing. From birth to hogget shearing the high fleece weight hoggets had a significantly higher live weight than the control hoggets. Fleeces from the high fleece weight and control hoggets did not differ in yield or brightness. The high fleece weight hoggets had greater staple length, fibre diameter and staple strength with lower bulk and greater yellowness. Estimates of the heritability of live weight, fleece weight and wool characteristics agreed with published estimates, as did estimated genetic correlations between GFW and other characteristics. The heritability of brightness was low.},
	issn = {1176-5283},
	author = {Montgomery GW and Hughes G and Hill DF}
}
@conference {40067,
	title = {A comparison of spring and autumn calving for beef cattle production},
	booktitle = {Proceedings of the New Zealand Society of Animal Production},
	volume = {47},
	year = {1987},
	month = {Jan},
	pages = {115-118},
	publisher = {New Zealand Society of Animal Production},
	organization = {New Zealand Society of Animal Production},
	abstract = {Rapid expansion of the mussel farming industry in New Zealand, from an annual production of 300 t in 1977 to about 12,000 to at present resulted from the introduction of the longline system. This simple, efficient, low cost and aesthetically acceptable system allowed the new industry to exploit the rapid growth rate and available supplies of spat of the green-lipped mussel (Perna canaliculus). Spat supplies, food availability and market expansion are possible constraints on the continued growth of the mussel industry. The economics of growing, harvesting, processing and marketing hold the key to the industry{\textquoteright}s future potential.},
	issn = {1176-5283},
	author = {Montgomery GW and Davis GH}
}
@conference {39939,
	title = {The effects of season on reproduction in beef cows - a review},
	booktitle = {Proceedings of the New Zealand Society of Animal Production},
	volume = {45},
	year = {1985},
	month = {Jan},
	pages = {43-48},
	publisher = {New Zealand Society of Animal Production},
	organization = {New Zealand Society of Animal Production},
	abstract = {The aim of this study was to examine the temporal relationships between FSH concentrations in blood and their effects on ovarian follicular viability, oestradiol synthesis and ovulation rates in Romney ewes. Collectively, the results showed that: (1) the number of non-atretic antral follicles (>/-1mm diameter) in sheep ovaries is influenced by plasma FSH concentrations; (2) the level of follicular oestradiol biosynthesis can be enhanced by FSH supplementation; and (3) sustained elevations of plasma FSH concentrations for 24 but not 6 h within 48 h of the onset of luteolysis significantly enhance the ovulation rate in Romney ewes.},
	issn = {1176-5283},
	author = {Montgomery GW}
}
@conference {39872,
	title = {Effect of season on ovarian and pituitary activity in cows},
	booktitle = {Proceedings of the New Zealand Society of Animal Production},
	volume = {44},
	year = {1984},
	month = {Jan},
	pages = {19-20},
	publisher = {New Zealand Society of Animal Production},
	organization = {New Zealand Society of Animal Production},
	abstract = {One hundred and four ewe lambs born in 1980 to either ewes that had been immunised against steroid hormones or untreated control ewes were retained for study of their subsequent growth and reproductive performance. There was no significant effect of dam immunisation on growth rate or reproductive performance as hoggets, 2-tooths or 4- tooths. Dam breed (Coopworth or Romney) was the major factor influencing reproductive performance. Mean lamb birth weight was 3.7 kg, weaning weight 18.7 kg, hogget mating weight 40.0 kg, 2-tooth mating weight 54.4 kg and 4-tooth mating weight 60.4 kg. At 9 months of age 83\% had exhibited oestrus and their ovulation rate was 1.08, as 2- tooths, 96\% mated in the first cycle with an ovulation rate of 1.68 and a conception rate of 80\% to first service. They had a lamb drop of 1.49 lambs born/ewe joined and weaned 1.35 lambs/ewe joined. The respective figures as 4-tooths were 98\%, 1.8, 85\%, 1.43 and 1.34. These data indicate that immunisation of ewes against steroid hormones has no adverse effects on the performance of their progeny.},
	issn = {1176-5283},
	author = {McNatty KP and Heath D and Lun S and Henderson KM and Hudson N and Gibb M and McDiarmid J and Montgomery GW and Thurley DC}
}
@conference {39659,
	title = {Effect of nutrition on ovulation rate and litter size in Booroola-Merino cross and Merino ewes - Brief Communication},
	booktitle = {Proceedings of the New Zealand Society of Animal Production},
	volume = {40},
	year = {1980},
	month = {Jan},
	pages = {43},
	publisher = {New Zealand Society of Animal Production},
	organization = {New Zealand Society of Animal Production},
	issn = {1176-5283},
	author = {Bray AR and Montgomery GW and Wallis TR}
}
@conference {39700,
	title = {Interval from calving to first oestrus in autumn- and spring- calving herds in the same locality},
	booktitle = {Proceedings of the New Zealand Society of Animal Production},
	volume = {40},
	year = {1980},
	month = {Jan},
	pages = {280-284},
	publisher = {New Zealand Society of Animal Production},
	organization = {New Zealand Society of Animal Production},
	issn = {1176-5283},
	author = {Montgomery GW and Davis GH and Hurrell GA}
}
