Arizona Agricultural Experiment Station 



283 



TABLE Nil. WEIGHT OF CLIPS OF WOOL INCLUDING ONLY SHEEP HAVING 



SIX CLIPS 



The pure-bred Tuni.s sheared heaviest in their second dipping. The 

 third and fourth chps were Hghter, while their sixth dip was nearly 

 as heavy as the second. The Tunis-Native cross sheared much heavier in 

 the third year, but next highest in their fifth. This cross does not com- 

 pare well with the other crosses in this regard. The Hampshire-Native 

 and Hampshire-Tunis-Native crosses both gave a heavier dip at two 

 years of age than at any other time. It is found in averaging the clips 

 of these various crosses that the third clip is heaviest, the fifth clip next, 

 w hile the second clip takes third place. 



7\ciu iitlicritaiicc study: It is highly important that a high de- 

 gree of fecundity exists in a breed of sheep. It is readily seen that a 

 flock throwing a large percentage of twins will increase in numbers 

 much more rapidly than where single lambs are the rule. If there is 

 any means by which the percentage of twin lambs can be increased it 

 would be of value to sheep growers. 



A study has been made of the Experiment Station ewes, to find 

 whether any of the crosses being used were more productive of twins 

 than others, and to find whether ewes that are twins are more likely 

 to throw twin lambs than single ewes are. This study has not been 

 finished, but the data in Table XIII is submitted to show the results of 

 the investigation so far. 



The Shropshire and Hampshire crosses as well as the pure-bred 

 Shropshires seem productive of many twins. The Tunis breed and its 

 crosses favor single lambs. 



• Both the single and twin ewes produced more single than twin 



