NDLI: Genetic trends for objectively measured and subjectively assessed traits in a Dorper sheep flock

Content Provider	Springer Nature Link
Author	Zishiri, Oliver Tendayi Cloete, Schalk Willem Olivier, Johannes Jacobus Dzama, Kennedy
Copyright Year	2012
Abstract	Genetic trends were constructed to monitor the genetic change for subjectively assessed and objectively measured traits using data emanating from complete records from the National Small Stock Improvement Scheme database and performance records accumulated by a single breeder over a period of 24 years. The objectively measured production traits considered were weaning weight, post-weaning weight (PWW), yearling weight, average daily weight gain to weaning (ADGW), average daily weight gain during post-weaning phase (ADGPW) and average daily weight gain up to yearling age. The subjectively assessed traits (scored on a five-point scale) were conformation, fat distribution, size, type and colour. Direct genetic trends for live weight and growth traits (with the exception of ADGPW) were positive. All the objectively measured traits where maternal effects were significant, except PWW, registered small declines in maternal breeding values. The fastest genetic progress was attained by ADGW, which amounted to 0.29 % of the overall phenotypic mean per annum. Conformation and type exhibited positive but slow increments in direct breeding values at an equivalent annual rate amounting to 0.12 and 0.09 % of the overall phenotypic mean, respectively. Size demonstrated a negative genetic trend of −0.14 % of the overall phenotypic mean per annum. Genetic trends for fat distribution and colour were negligible. It was concluded that breeders should focus more on the performance recording of objective traits as they are likely to respond favourably to selection pressure.
Starting Page	517
Ending Page	524
Page Count	8
File Format	PDF
ISSN	00494747
Journal	Tropical Animal Health and Production
Volume Number	45
Issue Number	2
e-ISSN	15737438
Language	English
Publisher	Springer Netherlands
Publisher Date	2012-08-31
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Direct Maternal Regression Selection response Breeding value Zoology Veterinary Medicine
Content Type	Text
Resource Type	Article
Subject	Animal Science and Zoology Food Animals

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

Genetic trends for objectively measured and subjectively assessed traits in a Dorper sheep flock.

Direct and maternal (co)variance components, genetic parameters and annual trends for growth traits of Dorper sheep in semi-arid Kenya

Direct and maternal (co)variance components, genetic parameters, and annual trends for growth traits of Makooei sheep in Iran

Relationships of subjectively assessed wool and conformation traits with objectively measured wool and live weight traits in the Tygerhoek Merino flock

Direct and maternal (co)variance components, genetic parameters and annual trends for growth traits of Dorper sheep in semi-arid Kenya.

Study of the environmental, genetic and phenotypic trends for pelt traits and body weight traits in Zandi sheep

Genetic trends for live weight traits reflect breeding strategies in registered Charolais Farms in Mexico

Genetic parameters for subjectively assessed wool and conformation traits in the Tygerhoek Merino flock

Genetic parameters for subjectively assessed wool and conformation traits in the Tygerhoek Merino flock

Genetic trends for objectively measured and subjectively assessed traits in a Dorper sheep flock

Similar Documents

Genetic trends for objectively measured and subjectively assessed traits in a Dorper sheep flock.

Direct and maternal (co)variance components, genetic parameters and annual trends for growth traits of Dorper sheep in semi-arid Kenya

Direct and maternal (co)variance components, genetic parameters, and annual trends for growth traits of Makooei sheep in Iran

Relationships of subjectively assessed wool and conformation traits with objectively measured wool and live weight traits in the Tygerhoek Merino flock

Direct and maternal (co)variance components, genetic parameters and annual trends for growth traits of Dorper sheep in semi-arid Kenya.

Study of the environmental, genetic and phenotypic trends for pelt traits and body weight traits in Zandi sheep

Genetic trends for live weight traits reflect breeding strategies in registered Charolais Farms in Mexico

Genetic parameters for subjectively assessed wool and conformation traits in the Tygerhoek Merino flock

Genetic parameters for subjectively assessed wool and conformation traits in the Tygerhoek Merino flock

Genetic trends for objectively measured and subjectively assessed traits in a Dorper sheep flock