Average carcase weights have also increased from 305kg in 2011 to 311kg in 2012, suggesting that target fat class is being sacrificed in pursuit of higher weights in heifers.
Prime beef carcase weights have risen between 6kg and 9kg across all classes to average 337kg.
QUALITY Superior carcase
sire Fisher 1 Ensign bred by WJ Hutchings & Sons
In the meantime, if anyone comes across an animal carcase
in a river, they are asked to notify the Environment Agency on 0800 807060.
Kim added: "With over half the carcases failing to meet both the preferred conformation and leanness targets there clearly remains considerable room for improvement in responding to the demands of the modern beef market within current production constraints."
These are the results of the latest annual carcase classification figures from English Beef and Lamb Executive.
The splitting of the carcase takes place when the sheep has two broad teeth showing.
NFU national livestock board chairman and Lancashire farmer Thomas Binns said: "The splitting of the carcase is adding significant cost to the industry and devaluing farmers' produce.
For the first time in recent years the proportion of carcases
meeting the "R or better" target for conformation in 2006 exceeded 50%, suggesting breeding improvements could now be having a positive effect alongside better management.
Overall, MLC carcase
classification reports for more than 148,000 prime cattle slaughtered in England in 2005 show 41% of prime beef meeting the preferred "R4L or Better" specification.
Alison Middleton, prosecuting for the local authority, said the regulations requiring prompt removal of dead animals from farmland were aimed at preventing the spread of disease, either through watercourses or to other livestock through scavengers feeding from carcases
"With pricing regimes imposing penalties of up to 10p/kg for underweight bull carcases
, the difference in returns between 250kg and 300kg carcases
of the same quality at today's prices can easily be pounds 100 a head."