Murray Rogerson

          
       

Library

ASBV INDEX INFLATION

Inflation
Inflation is somewhat like Bacon’s description of hope, it provides a mighty breakfast but leaves you pretty hungry by supper. Many stud breeders pursue the art of index inflation by crossing different strains of blue ink, morally questionable but… Continue reading

THE ASBV ENGINE ROOM

Accuracy Levels

I have performed scores of both large and small calculations during the last decade and without exception ASBV trait accuracy levels are randomized.

Table 1 below is a standard example.

1.33 is the Stirling 10 percentile cut-off. Only… Continue reading

WHAT IS O.V.I.S

Data collection dating back to 1974 was fed into the databank of LAMBPLAN which began in 1985 incorporating 8 major breeds, Poll Dorset, White Suffolk, Texel, Merino, Suffolk, Border Leicestor, Corriedale and Coopworth.

As LAMBPLAN grew Dr Arthur R Gilmore… Continue reading

CHALLENGE AND SELECT

Introduction
In 2005 when Stirling Dohne Stud started, I found the productivity of the breed almost mind-blowing but so were their faults. I took an early interest in muscle but then realized that the wool had to be corrected to… Continue reading

OPTIMAL OVINE SPECIES SIZE

The Effects of Gravity
Grazing mammal figures can be extremely variable, but approximately for every ten-fold increase in adult weight, fecundity halves, conversion rate doubles, metabolism decreases and food fibre consumption percentage increases. A 60kg sheep is capable of 1.3… Continue reading

Foot Forward

As a child before the  advent of  thibenzole sheep drench I remember both parents dagging sheep until well after 10PM completely enclosed by an 8 feet high edifice, stretching perhaps 20 feet to the horizon.

Before this time… Continue reading

The Decision – Dietary Fibre

DIETARY FIBRE – My personal decision to breed Dohnes was driven by the conversion of dry summer feed, excess to the spring flush into a usable product. Dohnes and Dorpers seem to be the only developed breeds that do this… Continue reading