Published 1967 .
Written in EnglishRead online
|Statement||by Marcus Tebid Munji.|
|The Physical Object|
|Pagination||, 70 leaves, bound :|
|Number of Pages||70|
Download Performance of three inbred lines of Herford cattle and their linecrosses
Twenty-three of the male calves were inbred while 56 were linecross calves. There were 16 inbred and 42 linecross female calves. The purpose of the study was to compare the mean performance of any two inbred lines used to make crosses with the mean performance of their reciprocal linecrosses for possible heterotic : Marcus Tebid Munji.
Graduation date: Three inbred and relatively unrelated lines of Hereford cattle\ud (1. Lionheart, 2. Prince, and 3. David) developed at the Corvallis\ud branch of the Oregon Agricultural Experiment Station as part of the\ud W-1 project of the Western States were crossed annually from \ud through inclusive.
This work quantifies the change in inbreeding levels for such an inbred line of Hereford cattle. It was found that inbreeding levels increased and decreased over the year existence of the line. Effects of inbreeding and heterosis and the difference between them were estimated by comparing linecross (L), topcross (T), inbred (I) and control line (C) Hereford females for reproductive and.
Three populations of Hereford cattle differing in inbreeding levels and genetic potential for growth were genotyped for seven DNA polymorphisms. Abstract. Graduation date: The investigations were based on a complete diallel cross\ud among three inbred lines of Hereford cattle.
Records of Angus calves\ud born during the same period were used to obtain more accurate\ud estimates of environmental effects and to determine breed differences\ud among the various traits included in the study.
In this video I mentioned they are a three frames score, this is what I believe they were. Jim has later told me he believes they are a 4 frame score. Anxiety 4, The first Herford. Records of five inbred lines at the Livestock and Range Research Laboratory were used to evaluate effects of inbreeding and heterozygosity on preweaning traits.
Members of each line. over.5 is unlikely in a seedstock herd of beef cattle. The Line 1 Hereford cattle developed at the Montana research station would be an example of an inbred line of cattle. The general formula for an inbreeding coefficient is as follows: F X = ∑ [(1/2)n+1(1+F A)] where F X = inbreeding coefficient of individual X,File Size: KB.
The American Hereford Association is second-largest U.S. beef breed associations with more than 7, active adult and junior members. The American Hereford Association is a. The objectives in developing inbred lines of Hereford cattle in the Colorado project were: 1) to increase the predictability of breeding performance of beef animals, 2) to explore the possibility of exploiting hybrid vigor within a pure breed and to determine whether.
Crossing two inbred lines of cattle can have a similar outcomes to crossbreeding. With that said if you have a favorite breed of bull, and you utilize that breed every year in your herd choosing. The maximum inbreeding coefficient was 76% for a cow born inexceeding the maximum value of 68% reported by Russell et al.
() for a line of Herefords intensively inbred for approximately 30 yr. Such extreme inbreeding could be expected in the Herefords, where bythe majority of animals have some degree of inbreeding, and where Cited by: PSXIV Inbreeding depression in a Hereford beef cattle population using the pedigree and genomic information.
December Journal of Animal Science 96(suppl_3) Inbred strains (also called inbred lines, or rarely for animals linear animals) are individuals of a particular species which are nearly identical to each other in genotype due to long inbreeding.
A strain is inbred when it has undergone at least 20 generations of brother x sister or offspring x parent mating. Inbred the offspring of a cross-pollinating plant obtained as a result of repeated forced self-pollination.
With repeated self-pollination the viability and yield of the offspring are decreased, while the homogeneity in respect to the genotype is increased. As a result of heterosis, hybrids from the crossbreeding of inbreds are substantially superior to.
Their estimates ranged from % in an Angus x Hereford backcross generation to % in a second generation rotational Brahman-Hereford cross. Heter,sis also increases birth weight when crossing lines of cattle within the same by: Reproductive performance of Hereford cows bred to produce inbred and linecross calves.
83 Reproductive performance of Hereford and Angus cows. 86 Heterosis of linecross calves by sex for birth date and birth weight.
89 Heterosis of linecross calves by sex for preweaning average daily gain and age at kg. The Line 1 Hereford cattle developed at the Montana research station would be an example of an inbred line of cattle. The general formula for an inbreeding coefficient is as follows: F X = ∑ [(1/2) n.
PERFORMANCE OF THREE INBRED LINES OF HEREFORD CATTLE AND THEIR LINECROSSES INTRODUCTION The improvement of productive traits in beef cattle is slow due to the long generation interval and the long interval between calvings ( days in Friesian cattle as reported by El-Sheikhand El-Fouly, ) and because of single births.
EFFECTS OF INBREEDING AND HETEROZYGOSITY ON PREWEANING TRAITS IN A CLOSED POPULATION OF HEREFORDS Flower, A. E., J. Brinks, J. Urick, and F. Willson. Comparisons of inbred lines and line crosses for performance traits in Hereford range cattle. and synthetic variety production involving inbred lines of Hereford cattle.
Line breeding idea explained Dec and then you would come back on those daughters with one of their half brothers out of the same father. closely related the cattle are in a line breeding. SA Hereford Cattle The most popular breed of cattle in the world, for many good reasons.
Since the first Hereford cattle were imported from England inholds the SA Hereford Centenary Celebration. Nosy Rosy was honoured to have been invited to a well organised and warmhearted media launch of an exciting preview of the / [ ]. Book arrived faster than expected from the USA, very interesting book, far better than anything I have read before, explains all the principles of Line breeding whether for Herd or flock of any animal by a man who has practical knowledge this is not just a theoretical explanation like so much of the information available on the internet, the man is a farmer and draws on a wealth 5/5(1).
The investigations were based on a complete diallel cross among three inbred lines of Hereford cattle. Records of Angus calves born during the same period were used to obtain more accurate estimates of environmental effects and to determine breed differences among the various traits included in the : Paul Edwin Humes.
All Herefords trace to a small group of similar type of cattle developed in Herefordshire, and all registered Herefords trace to those animals in the original Herdbook. That is why Herefords of today that are purebred or closed line have the unique color patterns and composition associated with purebred Herefords.
The three inbred lines used in this experiment were all started from the same parental stock and were bred as one-sire and ewe lines.
To produce the material for starting the three lines, a ram se-lected on the basis of the performance of his offspring was mated to 75 unrelated ewes. Ewe lambs produced from this mating were ran. Pure-bred vs Crossbred vs Mixed Breed Cattle: developed in the 's using a mix of approximately 25% Hereford, 25% Shorthorn and 50% Brahman cattle in order to create a hardy heat and cold tolerant breed capable of thriving in the harsh South Texas climate.
which is a significant boost in their performance (faster growth rates, higher. Comparison of inbred and noninbred lines, changes in patterns over time and effects of level of inbreeding and reproductive performance.
McCurley JR, Butts WT Jr, Bovard KP. Mature weight (A) and rate of maturing (K) were estimated for Angus, Hereford and Shorthorn cows utilizing the asymptotic regression equation Yt=A(1-Be-Kt).Cited by: 9.
Herefords are descendents of Anxiety 4th through the top line of their pedigrees. The industry’s transformation Anxiety 4th truly revolutionized the beef cattle industry because of his strong hindquarters and his ability to pass that on, generation after generation. In an article written by Don Ornduff for the July Hereford Journal, OrnduffFile Size: KB.
An inbred line is a line of genetically similar individuals that are bred with each other for uniformity. Two inbred lines will be used to make a "hybrid", and the progeny will be bred with another cross to make a "double hybrid", getting the bene. Eleven maize inbred lines were pre-screened for transfor-mation using N6 salts.
A subset of three maize inbred lines was then systematically evaluated for post-infection ECIF and TF on four media regimes: N6 or MS salts in each of two distinct media backgrounds. Evidence is presented that transformation frequency for inbred lines B, B Since we've been breeding linebred Anxiety 4th Herefords exclusively of Straight Gudgell & Simpson breeding.
When the foundation for the herd was laid in the 's the "Straight-bred Anxieties", as they've long been called, were the premier beef animal in the western hemisphere, and possibly the entire world.
Characterization of DNA polymorphisms and their associations with growth and maternal traits in Line 1 Hereford cattle. Proc. 5th World Congress on. In livestock, crossbreeding was the antithesis of acceptable production practices.
Thus, the objective of initial research was the development of inbred lines of Hereford cattle particularly adapted to range conditions. Selection within each line was based upon performance rather than subjective visual standards.
crossbreeding, and selection. Examples include three cattle lines at the USDA Fort Keogh Livestock and Range Research Laboratory in Miles City, Montana. The Line 1 Hereford population has been an inbred line since (MacNeil, ). The composite gene combination (CGC) population was created in by crossing Red Angus, Charolais, and.
Some 30 well defined breeds of cattle have been listed in India. Three principal strains or varieties were brought to the United States and used in the development of the Brahman breed are the Guzerat, the Nellore, and Gir. In addition, the Krishna Valley strain was introduced and used to a lesser extent.
The general similarity of the Guzert. THERIOGENOLOGY OCCURRENCE OF NEONATAL AND POSTNATAL MORTALITY IN RANGE BEEF CATTLE. CALF LOSS INCIDENCE FROM BIRTH TO WEANING, BACKWARD AND BREECH PRESENTATIONS AND EFFECTS OF CALF LOSS ON SUBSEQUENT PREGNANCY RATE OF DAMS1 D.
Patterson2, R. Bellows, P. Burfening3 and J. Cited by: Evaluation of Inbreds for General Combining Ability. Inbred lines are evaluated for their general combining ability (GCA). There are three methods used: top cross, poly cross, and single cross. In top cross, crosses are made between inbreds and either a tester or an open-pollinated variety.
This is also known as an inbred–variety cross. Inbreeding depression (result of inbreeding where there is non-additive gene action:dominance, co-dominance, and epistasis) 3.
Expression of deleterious alleles due to recessive homozygosity (can lead to genetic defects) 4. May result in prepotency where the appearance or performance of his/her offspring is especially like his/her own. Line Crosses: Heterosis When inbred lines are crossed, the progeny show an increase in mean for characters that previously suffered a reduction from inbreeding.
This increase in the mean over the average value of the parents is called hybrid vigor or heterosis A cross is said to show heterosis if H > 0, so that the.Edward's syndrome is a serious condition causing 10% of those born with it to die within their first year.
The cause is tris the presence of three chromosomes at location All children with this condition are mentally retarded and suffer breathing problems and possible seizures.So instead of being line bred on A if the 2 nd position was occupied by A’s brother or sister the linebreeding shows as on their parents.
But the reality is while A and his siblings are not identical they draw from the same basket of genes and one sibling may offer something the other one does not so you hope to get a strong breeding with.