Animal breeding / by Laurence M. Winters.

  • Winter, Laurence Merriam, 1891-
Date:
1925
Catalogue details

Licence: Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0)

Credit: Animal breeding / by Laurence M. Winters. Source: Wellcome Collection.

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    308 INDEX Rodney, a sire of show animals, 131 Roland Cooperative Bull Association, 298 S Sales, 291 consignment, 296 public, 292 catalogs for, 292 Sanders, 137 Sanders and Dinsmore, 131 Saturation, effect on inheritance, 161 Schroeder, 259 Scrub defined, 178 sires, laws dealing with, 214 Segis Pietertje Prospect, 141 Segmentation, 42 Segregation, law of, 95 Selection, 215, 288 act of, 220 age and, 225 breed of stock, 285, 287 breeding test and, 220 class of stock, 286 constitution and, 227 correlated characters and, 217 fancy points and, 216 farm, 285 fashion and, 229 Holstein-Friesians and, 215 importance of, 215 individual and, 223 pedigree and, 228 performance and, 227 sex characters and, 227 sires, 288 type and, 223 useful characters and, 215 variations and, 155 Seminiferous tubules, 25 Sex, 52 Sex characters, secondary, 55 castration and ovariotomy, ef¬ fect on, 56 cause of, 55, 58 recessive, 58 transplanting sex cells and, 56 Sex characters, determination, 52 accessory chromosome theory of, 54 age and vigor of parents, 52 beyond control, 55 nutrition and, 53 time of mating and, 53 Sexual overwork, 246 Shaler, 168 Smith, 34, 60, 65, 76 Sni-a-Bar farm, grading beef cattle, 209 Sore eyes in lambs, 268 Spermatic fluid, 28 Spermatids, 25 Spermatocyte, 25 Spermatogenesis, 25 Spermatogonia, 25 Spermatogonium, 25 Spermatozoon, 26 vitality of, 43, 44 Stallion clubs, 299 Sterility, 244 abortion and, 254 causes of, 245 closure of the os uteri and, 250 cryptorchids and, 249 diseased reproductive organs and, 252 environment and, 247 exercise and, 246, 251 fibroid degeneration and, 250 free-martins and, 47, 250 hybrids and, 250 imperfect copulation and, 248 improper feed and, 247 masturbation and, 246 obstruction of vas deferens and, 249 overwork and, 248 problem of, 244 pus cells in semen and, 250 services a male can perform, 246 sexual overwork and, 246 treatment of, 252 Strangeway, 27, 29 Superfoetation, 45