Wild & Woolly
INSIDE THIS ISSUE: Research from the Southern Section of the American Science
2
Scrapie Update
3
Goat Twilight Tour & Tasting
3
US Sheep, Goat Inventory Declines
4
Webinar Recordings: Sheep & Goat Health
4
Accepting Nominations for 2014 Goat Test
5
Pen vs. Pasture Study Funded for Third Year
5
New Extension Director
6
Herbal De-wormer Fails to Control Parasites
6
Preparing for Ethnic Holidays
7
New Resources from NCAT/ATTRA
7
New Product: Electric Hoof Knife
8
Junior Sheep & Goat Skillathon
8
MPWV Spring Educational Conference
9
V O L U M E
Recipe: Grilled Lamb Sirloin
9
Abomasal Bloat
10
Calendar of Events
11
The University of Maryland Extension programs are open to any person and will not discriminate against anyone because of race, age, sex, color, sexual orientation, physical or mental disability, religion, ancestry, national origin, marital status, genetic information, political affiliation, and gender identity or expression.
X I I I
I S S U E
I I
S P R I N G
2 0 1 4
Breeding Better Sheep and Goats The National Sheep Improvement Program (NSIP) is a quantitative genetic selection tool designed to help sheep and goat producers make better breeding decisions. NSIP is in the business of calculating EBVs and helping producers use EBVs to their best advantage. EBV is the acronym for “estimated breeding value.” An EBV estimates the genetic worth of an animal. It is a description of an animal’s performance as compared to the average of the flock or breed. It predicts future performance of offspring. What is an EBV? EBVs can be calculated for any trait that can be measured or scored. A variety of EBVs are calculated for sheep and goats. EBVs are usually separated into trait categories, such as growth, reproduction, carcass, and wool. An EBV can also be calculated for disease resistant traits, such as fecal egg counts (parasite resistance).
EBVs are calculated using a computational procedure known as BLUP (Best Linear Unbiased Prediction). Because BLUP takes environmental influences into account, EBVs can be compared across flocks, so long as they are genetically-linked. At the farm level, differences in management are accounted for by comparing animals in the same contemporary group. A contemporary group is a group of animals, of similar age, that are fed and managed the same. Large contemporary groups improve the accuracy of EBVs. For small flock owners, the size of contemporary groups is a limiting factor. Selection indexes simplify EBVs by combining numerous traits into one number. What traits to include in the selection index and the weight to apply to each trait depends upon the importance of the trait(s) to the breed or production system. For example, the selection index for a maternal breed is very different than the selection index for a terminal sire breed.
Estimated breeding values are calculated from the animal’s own performance, performance from genetically-related traits, and performance of relatives for those traits. The accuracy of EBVs is influenced by several factors, but improves with genetic linkages. (Continued on Page 11)
National Webinar Series: NSIP The NSIP Relaunch Committee will be holding a series of webinars in May and June to teach sheep and goat producers about the National Sheep Improvement Program (NSIP). NSIP is a quantitative genetic selection tool designed to help sheep and goat producers make good breeding decisions. (Continued on Page 4)