390 (ji-oirth and Development of Breedx and Croftsea of Pigx 



T;il)lc 111. Comparatirc wrifjIitK of different breeds i)f piijs -Iba. 



In Table I it will be seen that there is variation in the average age at 

 which the difTerent breeds were exhibited so that the figures arc not 

 strictly comparable. 



Corrections have therefore been made for this from the rate of growth 

 shown in Table II and the comparative weights of breeds at the common 

 ages of 3, 5, 7, 9 and 11 months are given in Table III and it is to this 

 table that reference is made below. 



The breeds in Table HI are arranged in order of tlieir weight at 

 1 1 months old, the mature size of the breed ; the differences in the relative 

 order at the other ages are due to variations in the rate of maturity and 

 will be discussed below. 



The Lincolnshire Curly Coated (averaging 510 lbs.) is the heaviest 

 breed with the Large Wliite next some 30 lbs. fighter while the Large 

 Black follows closely weighing some 10 lbs. less. 



There is then a rather large drop of 50 lbs. to the Tamworth. with the 

 Berkshire some 10 lbs. below and the Middle White about 20 lbs. fighter 

 still. There is then a very big gap of some 1 10 lbs. to the now almost 

 extinct Small White. 



A few animals described as the Somersetshire breed (probably 

 Gloucester Old Spots) come midway between the Large Black and the 

 Tamworth in size ; while a few called Small Blacks and Dorsets are sfightly 

 fighter than the Middle Wliites. 



Much work on the comparative slaughter weight of pigs has been done 

 by Hofman-Bang, Morkeberg and Lund (27) in Denmark and has been 

 mainly directed to testing two breeds, the Large White and Native 

 Danish and their crosses. These tests, which give data of gain in five 

 weight per unit of food (consumed up to the age of approximately 200 days 

 and 200 lbs. live weight, conclude with carcase weights at that age only 

 and show consistent results in that the carcase weight of the Large White 



