AUTHOR’S ABSTRACT OF THIS PAPER ISSUED 
BY THE BIBLIOGRAPHIC SERVICE, MARCH 30 
THE INFLUENCE OF EXCESSIVE SEXUAL ACTIVITY 
OF MALE RABBITS 
ie ON THE NATURE OF THEIR OFFSPRING 
FRANK A. HAYS 
Towa State College 
TWENTY-TWO CHARTS 
CONTENTS 
MrT OCCT LOM Here ey crocs sire ee ekens ois 6 Fe sie He ane NACE RM e ee ara 571 
MUsiteriallPantderne GHOCUS ety a hiers see cece <5 e-3 ar voe-s. 4,4) ois epsusiotal’ SEAS CEPR os «Soar sa 573 
J Agaboa EN ITAUESTEXG| 4 eS olenes Gules Cid ao ce ERED eee hicaIE ie rafts ob. 6.5 5 o oer 573 
RRECONG SRN DURA ee ata ee ss cists ids aa Ae eas BER Oe esis ones 575 
NV ENN Over IR CMe aS UT eeere's ss obo. chs siereozen Sete os Dake ae OM se eee 575 
Methods of interpreting weights and measurements..................5- 579 
Dy Aa FATT ESUI See ee RR Sete Ses i's cia Sal Marek ane dards at or fh 582 
Growth in weight of young as related to frequency of copulation of sire. 582 
Mipter COEGIeM Is Ol VATIADINIGY: «2, ce eveure cose «3 st etn oS 2 594 
DEeLviceeLOMpicoeiicientssot varia bilityires..1.o-2 2. 5 cea eee e- . 597 
Growth by measurements as related to frequency of copulation........ 599 
Percentage mortality in offspring during the first five days of life and 
between the fifth and the ninetieth day of life....................... 605 
The Relation of number of services made to sex of offspring............ 606 
Sexeaoonel aed: tO maOnualliitives sa\.cu sivas seueteckstnie sie ol eT Rees sce 608 
AS THTATVOMATAY/ CLT MTTOLICIS Gat ie Ge ee ERE IED eR Dene tohs Meare Rn cin o.5 bo o 4 pote ieee 608 
LOSE RSS Ot AOE Re Sieg ne age eR CS co ccc 610 
Nel ea waynidK2xo lan SAVE A WES tateys Beate EO See eae oe aE ed. 0\.c 5, /0.0,9 0. eae 612 
LOU. NDT. 7 Se Rolo oe, 6A ee Store co: ee ‘613 
INTRODUCTION 
Too frequent copulation of males is often given as an impor- 
tant cause of weak and inferior offspring from the standpoint of 
growth and thriftiness. This idea seems to be rather universal, 
though evidence of such being the case is difficult to obtain. 
571 
