FLUSHING TO INCREASE LAMB YIELDS. 



13 



Table 7. — Gains made by single and twin lambs in bureau flocks at Middlebury, Vt. 



and Beltsville, Md. 





Single lambs. 



Twin lambs raised as 



twins. 



Twin lambs raised as singles. 



Sex and flock. 





Average weight. 





Average weig 



ht. 





Average weight. 





X) 

 - C3 











C3 











T3 



03 







































A 



A 



a 



o 



o 



a 



A 



A 





o 



o 



ft 



A 



g 



g 



o 





6 



"£ 



n 



a 



6 





a 



a 



a 



O 



H 



a 



a 



a 





Z 



S 



CO ■ 



SO 



3 



£ 



ffl 





to 



2 



'A 



M 



P3 



to 





M i d d 1 ebury 

































flock: 

































1916— Rams. . . 



5 



9.0 



75.6 



97.4 



130.8 



9' 



9.2 



68.2 



89.4 



131.0 



1 



7.8 



68.0 



84.0 



109.0 



Ewes 



8 



9.2 



64.8 



77.9 



C 1 ) 



10 



7.5 



55.6 



67.9 



C 1 ) 



S 



•7.8 



65.5 



81.1 



114.4 



1917— Rams. . . 



5 



7.9 



66.8 



94.8 



117.4 



4 



7.6 



59.5 



84.3 



108.5 



4 



7.8 



57.5 



87.3 



118.0 



Ewes 



11 



8.3 



61.7 



78.8 



106.7 



8 



7.5 



55.9 



76.5 



109.6 



3 



7.1 



67.0 



84.3 



111.7 



1918— Rams... 



8 



8.6 



56.4 



84.8 



121.8 



12 



7.4 



49.8 



77.9 



117.8 



1 



7.3 



51.0 



83.0 



119.0 



Ewes 



13 



8.8 



54.1 



76.8 



113.7 



11 



6.9 



38. 2 



63.8 



107.5 



2 



6.1 



41.0 



68.5 



101.0 



Average: 

 Rams 



18 



8.5 



64.6 



91.1 



123.1 



25 



8.1 



58.0 



83.1 



121.0 



6 



7.7 



58.1 



86.0 



116.6 



Ewes 



32 



8.7 



59.4 



77.9 



110.5 



29 



7.3- 



49.1 



68.9 



108.4 



13 



7.4 



62.1 



79.9 



111.7 



Beltsvilb flock: 

































1917— Rams . 



2 



8.4 



40.5 



69.0 



96.0 



3 



6.9 



45.2 



73.5 



94.7 



2 



6.2 



38.8 



67.8 



91.8 



Ewes.. 



8 



7.7 



42.8 



63.6 



82.0 



3 



6.4 



39.8 



60.8 



86.7 



1 



6.6 



55.0 



74.0 



96.0 



1918— Rams . 



5 

 3 



8.3 



8.2 



59.9 

 56.5 



82.7 

 69.0 



109.4 

 104.7 



6 

 3 



7.1 



5.8 



49.1 

 42.5 



77.3 

 68.2 



119.8 

 111.7 













Ewes.. 



1 



5.7 



39.6 



61.0 



83.0 



1919— Rams . 



9 



8.0 



54.4 



65.1 



100.2 



5 



7.3 



45.6 



60.6 



97.8 



4 



6.6 



55.1 



66.3 



97.0 



Ewes.. 



13 



8.1 



53.2 



66.5 



91.2 



8 



6.6 



50.7 



64.9 



90.3 



3 



6.7 



53.5 



68.7 



92.7 



1920— Rams . 



7 



8.4 



60.3 



82.0 



124. 5 



14 



7.2 



51.0 



78.9 



117.5 



1 



6.8 



40.0 



67.0 



106.0 



Ewes.. 



17 



8.3 



47.8 



64.5 



98.8 



17 



6.5 



44.8 



64.8 



102.3 



2 



6.9 



55. 5 



70.0 



92.0 



Average: 

































Rams 



23 



8.2 



56.2 



74.4 



109.2 



28 



7.2 



49.0 



74.7 



112.0 



V 



6.5 



48.3 



66.8 



96.8 



Ewes 



41 



8.1 



49.2 



65.3 



93.6 



31 



6.5 



45.6 



64.8 



98.6 



7 



6.6 



52.2 



68.7 



91.6 



Average: 

 All rams... 



41 



8.4 



59.9 



81.7 



115.3 



53 



7.6 



53.2 



78.7 



116.3 



13 



7.0 



52.8 



75.7 



105.9 



All ewes... 



73 



8.4 



53.6 



70.9 



■ 99.8 



60 



6.9 



47.3 



66.7 



102. 3 



20 



7.1 



58.6 



75.9 



104.7 



All lambs. . 



114 



8.4 



55.9 



74.8 



105.8 



113 



7.2 



50.2 



72.3 



109.5 



33 



7.1 



56.9 



75.9 



105.2 



/ 



1 Placed in special experiment and weight not comparable. 



SUMMARY. 



1. Feeding at breeding time to increase the number of twins pro- 

 duced by ewes is called " flushing." 



2. The percentage of lambs produced by a flock depends upon the 

 number of dry ewes and the proportion of ewes producing twins 

 and triplets. 



3. The practical advantage of flushing lies in the production of 

 twins, which in turn depends upon the number of ova produced by 

 the ewe. 



# 4. Experiments reported herein indicate that ewes getting in lamb 

 first produce the largest percentage of twins. 



5. Data from experimental work indicate that ewes should gain 

 at least 7 pounds a head during the breeding season to obtain largest 

 percentage of twins. 



6. There seems to be a natural tendency toward twin production, 

 which varies in different breeds. 



7. It is only in extreme cases that the ram has shown any influence 

 on the number of twin lambs produced by the flock. 



