laboratory animals, and as such may be listed by either gram or ounce weight. 28.3495 grams weight 1 oz. avoirdupois. All reliable breeding stock selections are quoted on age-weight basis, weight in ounces. Mature adult weights are attained by 16 to 18 weeks of age and are shown in () as follows:
Sub-standard breeding stock (3, to almost 4, oz.) generally produces satisfactorily for cage pets, elementary schools, parks, zoos, sportsmen (for animal and fish baits), experimental breeding and limited laboratory usage, and usually sells below standard stock prices.
Standard breeding stock (4 oz. upward), acceptable for all standard laboratory production as well as uses previously mentioned, is highly recommended to the average beginner planning to sell both laboratory animals and breeding stock.
Superior (premium), to highly superior, breeding stock (41⁄2 oz. upward), Is recommended for production of highest grades of commercial breeding stock and laboratory animals. Suitable for all hamster uses.
Selected for future breeders, females from 4 to 51⁄2 oz. standard stock should at 4 to 5 weeks weigh 2 to 21⁄2 oz., often more. The buyer of such females has the advantage of observing their growth until mating time. Mated at 8 to 10 weeks, they should make first quality mothers. A fine male, 41⁄2 oz. upward when purchased, may repay his cost in the extra quality of the first litter from his service. A good male does not need
breeding male—female contrast
painting or branding to identify his sex at a distance of several feet. Sex is readily observed, as shown In Illus. 1. The male is distinguished by his elongated rear section. Female squares off bluntly at the hips, as shown by the F and arrow pointing to the dash line showing how female hip and rear section appear In contrast when placed upon picture of male for comparison.
Buy breeding stock from a shipper who guarantees age and weight, and who also guarantees shipment of virgin females regardless of age. Otherwise, you may pay for females whose best production is already past.
WARNING: A few commercial shippers price breeding stock with record of production pedigree at about 2 to 3 times what same quality of stock may cost from most reputable persons selling standard to superior stock. Experienced small stock raisers are not suckers for such bait.
Buy your breeding stock from a hamstery where honesty counts. Two or three pairs or trios, or two sets, is a good start for a beginner. A set consists of 1 male and 3 females. Some shippers offer a lower
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