@conference {40746,
	title = {Genetic markers in Inverdale (FecX) sheep},
	booktitle = {Proceedings of the New Zealand Society of Animal Production},
	volume = {55},
	year = {1995},
	month = {Jan},
	pages = {307-309},
	publisher = {New Zealand Society of Animal Production},
	organization = {New Zealand Society of Animal Production},
	abstract = {The Inverdale gene (FecX) is carried on the sheep X-chromosome.  Males carrying the Inverdale gene always pass a copy to their daughters,  but not to their sons. Females carrying a single copy will pass the  gene on to half of their offspring (both male and female). Progeny  testing to determine which rams carry the gene, and which offspring have  inherited, is time-consuming. Successful management of the Inverdale  gene will require a simple, quick inexpensive test to distinguish  carriers and non-carriers.    A research programme has been initiated to develop a DNA test using DNA  markers which will identify carrier animals at birth. Our initial  strategy to find suitable markers was to build a map of genes and DNA  markers on the sheep X-chromosome as a framework for looking for the  Inverdale gene. We have determined the relative positions of twenty  genes and DNA markers on the X-chromosome by looking at the pattern of  inheritance of the X-chromosome markers in sheep pedigrees established  in flocks at Invermay and Tuatapere. We estimate that 80\% of the  chromosome has been eliminated in our search to the Inverdale gene.  Efforts are now directed towards identifying the particular region of  DNA in which the Inverdale gene might lie. Suitable markers must be  close enough to the Inverdale gene to be always inherited with  Inverdale. Once such markers are identified a test can be developed to  determine the Inverdale status of animals. Adaptation of the current  techniques will enable DNA to be isolated from a few drops of blood, a  mouth swab, or the ear tissue from a newborn animal.   },
	issn = {1176-5283},
	author = {Galloway SM and Hanrahan V and Potts MP and Hill DF}
}
@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 {40289,
	title = {Karyotyping Booroola gene carriers},
	booktitle = {Proceedings of the New Zealand Society of Animal Production},
	volume = {51},
	year = {1991},
	month = {Jan},
	pages = {91-94},
	publisher = {New Zealand Society of Animal Production},
	organization = {New Zealand Society of Animal Production},
	abstract = {The success of a multiple-ovulation and embryo transfer  programme involving five breeds of sheep (Danish and Finnish Texel,  Oxford Down, Gotland Pelt, and the White Headed Marsh) was compared  across two seasonal periods. Results for the incidence of oestrous,  ovulation rate, embryo recovery rate, fertilisation rate, and for the  survival rate of the embryos to scanning and lambing in recipient ewes,  were compared. The ovulation rate (7.8},
	issn = {1176-5283},
	author = {Lord EA and Hill DF}
}
@conference {40287,
	title = {Sheep map: The New Zealand programme to map the sheep genome},
	booktitle = {Proceedings of the New Zealand Society of Animal Production},
	volume = {51},
	year = {1991},
	month = {Jan},
	pages = {85-86},
	publisher = {New Zealand Society of Animal Production},
	organization = {New Zealand Society of Animal Production},
	abstract = {A series of four trials, each involving 1200 ewes have been  conducted over the period 1986 to 1990. Ewes have been treated with  various synchronisation treatments and the time to onset of oestrus  monitored each month of the year. Results indicate that while overall  mean values for each year don{\textquoteright}t differ, there were significant seasonal  effects within years with the interval to onset being shorter during the  breeding season. However, the maximum difference between monthly means  in any one year varied from 27 h to 17 h. Significant effects of  synchronisation device were seen with ewes treated with sponges having a  longer (+ 8 h) interval to onset than ewes treated with CIDR devices.  While effects of ewe age and ewe liveweight were seen in some trials no  consistent trend was identified. On most occasions significant  interactions with month of year indicated inconsistency of effect within  any one trial. The recorded variation in interval from device removal  to onset of oestrus is in agreement with that reported between flock in  the field. This variation is sufficient to effect conception rates to  artificial insemination performed on a time basis and evaluation of  contributing factors is required for the development of protocols for  this activity.  },
	issn = {1176-5283},
	author = {Hill DF and Broad TE}
}
@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}
}
