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Across-Breed Matings: How They Work |
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Author: Hurst |
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State: US Year: 2000 |
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Excerpt: Jersey Journal article about heterosis: " In reality, what you may have thought was hybrid vigor in that first cross might have mostly been the contribution of the Jersey breed on an additive gene basis."
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AI Bull Census Report - detailed reports by breed (Holstein, Jersey & Brown Swiss) |
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Author: Animal Breeding Group |
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State: NY Year: 2007 |
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Excerpt: AI Multiple Trait Cow & Sire Evaluation for Summer 2007. Bulls ranked within breed by MFP$, milk, fat, protein, 48-month stayability, confidence range, % fat, % protein, MF$, number of daughters
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An ICAR recommendation sheet for udder health & estimation of genetic parameters for udder health |
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Author: Hiemstra, Groen, Bovenhuis, Ducro, de Jong |
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State: Global Year: 2002 |
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Excerpt: An upgrade of the present-day udder health index seems worth while. It seems that somatic cell score can keep its heavy weight in the udder health index, just as udder depth. An extremely high or low milking speed might need to be given a negative weigth.
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Animal Model Basics |
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Author: none specified |
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State: US Year: 1990 |
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Excerpt: Simplified explanation of the animal model. In 1989 it became the basis for genetic evaluations for Jersey bulls & cows in the United States. The model provides joint & simultaneous evaluations for bulls & cows based on female records.
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Artificial Insemination Sires Differ in Semen Fertility |
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Author: Rogers |
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State: TN Year: 2003 |
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Excerpt: Despite the best efforts of breeding companies, semen from AI sires does vary somewhat in fertility. This variability is predictable over time & poor fertility AI sires identified from past data will more likely have poor fertility in the future.
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Breakthroughs In Biotechnology |
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Author: Seidel |
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State: CO Year: 1996 |
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Excerpt: Research equips producers with an array of genetic improvement tools. A discussion of various biotechnologies (ET, In vitro fertilization, sexing embryos, bisection of embryos, cloning) - including their benefits & drawbacks.
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Breeding for Improved Resistance to Mastitis |
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Author: Rogers |
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State: TN Year: 2001 |
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Excerpt: Mastitis resistance should be considered in a breeding program. Selection for lower SCS will improve mastitis
resistance. Selection for higher more tightly attached
udders will reduce mastitis.
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Breeding for increased angularity & reduced body condition is a mistake |
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Author: Rogers |
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State: TN Year: 2002 |
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Excerpt: Sires with daughters that have higher body condition scores also have daughters with fewer days to first service, higher first service conception rates & shorter calving intervals.
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Breeding for Profitability & Longevity in Dairy Cattle |
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Author: Rogers |
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State: TN Year: 2001 |
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Excerpt: Summary: Longevity, health, fitness & husbandry traits are heritable & economically important. Selection for lower SCS & higher udders will reduce mastitis & increase longevity. Selection for improved feet & legs may increase longevity. Etc.
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Commonly Asked Questions Regarding CVM |
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Author: none specified |
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State: US Year: 2001 |
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Excerpt: Complex vertebral malformation (CVM) is a recessively inherited genetic defect that was discovered in 2000 by Danish scientists. CVM is suspected to cause embryonic deaths, abortions, & stillborn calves, some with visible deformities.
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