The breeding policy at Dynevor continues the successful programme of linebreeding to Dynevor Torpedo. The current herd sire, Bickleigh Olympic (a grandson of Torpedo) has followed Catfield David and Dynevor Taoiseach (both sons of Torpedo). Al were rated as PASS PLUS (AA) bulls.

Dynevor Taoiseach, one of the outstanding bulls in the breed in recent times, retired from stud duties in 2007 after six years as senior herd sire with the Dynevor herd. Taoiseach excelled both in his own assessment (see table below) and in progeny test. His steer progeny had a plus rating of 8.4% at weaning and 13.8% at 900 days (equal to 90 kg liveweight and £100-200 extra carcase value. Young bulls of remarkable merit (Crane Majestic, Smoile Charlie and Wytch Condor) are linebred to Taoiseach.                                                                                                                                                               
                                                                                                                                                                        
Breeding Policy                                                                                            .    

I own both the Dynevor and Dinefwr herd prefixes, but currently loan the Dinefwr prefix to the National Trust in Wales, to whom I sent cattle to establish a satellite herd at Llandeilo in 1992.
The Dynevor Herd of White Park cattle is the senior herd in the breed. It has exerted a powerful influence since the Herd Book was first published in 1918, and in recent years has produced animals of high genetic merit that have been used widely in the breed. A controlled programme of linebreeding has been followed, based primarily on a remarkable brood cow, Dynevor Tawe 3 (born 1969), and more recently on her grandson Dynevor Torpedo (born 1983).                                  (Torpedo on Salisbury Plain © CLL)
Tawe 3 established a dynasty which has produced many bulls used widely in leading herds throughout the breed. She herself produced Ingleyhill and Troubadour (who was the sire of three important bulls - Dynevor Rampant, Hale Thomas and Broom Stephen).
Her daughters, Tawe 7 and Tawe 9, produced Torpedo (unrivalled reputation) and Toddington Daniel respectively. 
Her grand-daughter, Toddington Apple, produced Huntsmorpark Alex. 
Her great-grand-daughters, Tawe 26, Tawe 27, Tawe 29 and Tawe 43, produced Taoiseach (outstanding bull of the breed), Treorchy, Trumpet, Druid, Talisman (semen available from Breed Society) and Westholme Austin, and her ggg-grand-daughter, Tawe 47, produced Teilo Gruffydd.

All White Park bulls are inspected for registration, and are assessed for mature merit. Records from more than 200 bulls are shown on the Breed Society website, and bulls from the Dynevor herd, or sons of Dynevor bulls, feature prominently in the top ranking bands (see table below). The qualities evaluated for each bull are weight, body length, rump area and scrotal circumference, and are expressed as the % difference from breed average. Bulls previously were ranked in seven groups (see below) but these ranks now have been simplified to Pass Plus, Pass, and Fail.
AA Highest ranking
A   Significantly above average
B+ Middle band plus
B-  Middle band minus
C   Below average
D   Significantly below average (not eligible for registration) 
DD Lowest ranking (not eligible for registration)  
 

Some of the bulls from Dynevor lines are shown below. 

Inspected Bulls                                                                                                  

Bull name	Rank	Sire	Dam	Weight	Length	Rump	Scrotal
Inspected bulls
Ash Niknak	B+	Dynevor Calibre	Ash Blueberry	0.06	3.10	10.21	7.63
Ash Poplar	AA	Dynevor Calibre	Ash Dupion	9.59	4.91	13.99	5.06
Bickleigh Hobson	B+	Dynevor Torpedo	March Kate	4.22	-0.29	5.92	0.55
Catfield David	AA	Dynevor Torpedo	Catfield Abigail	15.02	3.91	9.89	4.01
Dynevor Talisman *	AA	Dynevor Taoiseach	Dynevor Tawe 29	10.72	5.19	12.47	-1.03
Hembury Lindos	A	Dynevor Taoiseach	Smoile Emily	10.66	5.47	0.86	-1.41
Westholme Austin	B-	Dynevor Taoiseach	Dynevor Tawe 43	-1.81	0.07	6.47	-7.06
Reference and A.I. sires
Dynevor Calibre*	A	Dynevor Torpedo	Dynevor Caledon 3	9.57	6.43	3.91	5.50
Dynevor Druid	C	Dynevor Torpedo	Dynevor Tawe 27	-2.54	4.01	-9.31	7.48
Dynevor Rampant*	AA	Dynevor Troubadour	Dynevor Rachel 30	12.43	4.41	15.69	3.36
Dynevor Taoiseach	AA	Dynevor Torpedo	Dynevor Tawe 26	18.24	8.58	13.58	-4.22
Dynevor Torpedo	AA	Gallangad Hector	Dynevor Tawe 7	10.47	10.69	2.63	7.93
Hembury Inca	B+	Dynevor Taoiseach	Dynevor Caledon 4	4.54	5.80	-3.73	4.57
Leighton Oliver	B-	Dynevor Torpedo	Hollygrove Jemima	2.15	3.97	-2.29	5.69
Tilgate Hector	A	Dynevor Rampant	Tilgate Antigone	7.95	4.09	5.79	-0.22
* Bulls available by AI

Special Qualities of Dynevor Cattle                                                                   

The Dynevor herd demonstrates the thrifty efficiency of the White Park breed. It runs on top of Salisbury Plain throughout the year, but the cows still yield abundant milk and strong calves.

Young stock being retained for breeding are not forced and are allowed to develop naturally, so that they thrive when sold to kinder conditions and continue to breed to a great age. Two cows sent to Dinefwr in 1992 continued to breed until 20 years of age, and many breed until 16 years of age. 

Although the Dynevor herd does not show cattle, Dynevor animals in other hands have achieved outstanding success in the showring. Dynevor Rampant (born 1987) (right standing at AI centre © CLL), exhibited by Niall and Sue Osborne, was unbeaten for two years on the South of England circuit, beating the champions of 29 other breeds in the process. Dynevor animals were shown more frequently in the early twentieth century, and Dynevor Evelyn in particular had notable success being Royal Show Champion in the 1920s.