WebObtain 2-4 breeding pairs to establish a new colony. Additional breeders can significantly reduce the time needed to expand a colony. Combining males from different litters is only appropriate at weaning (3-4 weeks). Males combined later are likely to be aggressive and to fight, causing wounds and/or death to their male cage mates. WebApr 2, 2013 · Breeding performance indices support the practice of trio mating for certain strains of mice. Both the NIH Office of Laboratory Animal Welfare and the Association for …
Retrospective Analysis of Reproductive Performance of Pair-bred ...
WebMultiple different breeding schemes are acceptable and should be included in the IACUC protocol. In any case, the ... After the pups are weaned, the female may be returned to a trio breeding cage. WEANING PUPS . Weaning age for rat pups is routinely 21 days of age. In the case of some inbred, genetically modified or mutant ... WebApr 1, 2024 · A trio breeding scheme consisting of one sire and two dams per cage ( Fig. 1) allowed us to obtain our two strains as related cage mates, minimizing the effects of differences in maternal care. Under these conditions, there was … ranking of obama as president
Office of Research - Ohio State University
WebSep 2, 2010 · The breeding systems compared were selection within closed flocks (CF), a closed nucleus system (CNS), an open nucleus system (ONS) and open nucleus systems with the selection of nucleus replacements being restricted to either nucleus born males (ONSRm) or nucleus born females (ONSRf). WebJun 5, 2015 · Multiple males in a cage are not permissible with Trio Mating. This model takes advantage of postpartum estrus and allows the females to become pregnant and nurse at the same time. This method also allows for the females to share rearing responsibilities and may be useful when there is a history of maternal neglect. WebJan 14, 2024 · As Kelck22 said a trio is 1 rooster with 2 hens and a reverse trio is 2 roosters with one hen. Oct 21, 2013. Thread starter. #4. owl house season 2 characters