New John C, Kelch William J, Hutchison Jennifer M, Salman Mo D, King Mike, Scarlett Janet M, Kass Philip H
Department of Comparative Medicine, University of Tennessee, Knoxville 37996-4543, USA.
J Appl Anim Welf Sci. 2004;7(4):229-41. doi: 10.1207/s15327604jaws0704_1.
Studies report variable factors associated with dog and cat surpluses in the United States. Estimates of cat and dog birth and death rates help understand the problem. This study collected data through a commercial survey company, distributing questionnaires to 7,399 cat- and dog-owning households (HHs) in 1996. The study used an unequal probability sampling plan and reported estimates of means and variances as weighted averages. The study used estimates of HHs and companion animals for national projections. More than 9 million owned cats and dogs died during 1996-yielding crude death rates of 8.3 cat deaths/100 cats in HHs and 7.9 dog deaths/100 dogs in HHs. The study reported twice as many kitten as puppy litters, with an average litter size of 5.73 and 7.57, respectively. The study reported data on planned versus unplanned litters, reasons caregivers did not spay females, disposition of litters, and sources of animals added to HHs. These first national estimates indicate the magnitude of, and reasons for, animals leaving HHs. The crude birth rate was estimated to be 11.2 kittens/100 cats in HHs and 11.4 puppies/100 dogs in HHs.
研究报告了与美国猫和狗过剩相关的各种因素。对猫和狗的出生率和死亡率的估计有助于理解这一问题。本研究通过一家商业调查公司收集数据，于1996年向7399个养猫和养狗家庭发放了问卷。该研究采用了不等概率抽样方案，并将均值和方差的估计值报告为加权平均值。该研究使用家庭和伴侣动物的估计值进行全国预测。1996年，超过900万只家养猫和狗死亡，家庭中猫的粗死亡率为每100只猫中有8.3只死亡，狗的粗死亡率为每100只狗中有7.9只死亡。该研究报告称，小猫窝数量是小狗窝数量的两倍，平均窝仔数分别为5.73只和7.57只。该研究报告了关于计划内与计划外产仔、饲养者不摘除雌性动物卵巢的原因、窝仔的处理以及加入家庭的动物来源的数据。这些首次全国性估计表明了离开家庭的动物数量及其原因。家庭中猫的粗出生率估计为每100只猫中有11.2只小猫出生，狗的粗出生率为每100只狗中有11.4只小狗出生。
