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Reproductive biology of captive fishers.

Frost, Herbert C.

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Reproductive biology of captive fishers.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Reproductive biology of captive fishers./
作者:	Frost, Herbert C.
面頁冊數:	126 p.
附註:	Source: Dissertation Abstracts International, Volume: 56-01, Section: B, page: 0013.
Contained By:	Dissertation Abstracts International56-01B.
標題:	Agriculture, Forestry and Wildlife. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9513263

Reproductive biology of captive fishers.
Frost, Herbert C.

Reproductive biology of captive fishers. - 126 p.

Source: Dissertation Abstracts International, Volume: 56-01, Section: B, page: 0013.

Thesis (Ph.D.)--The University of Maine, 1994.

I studied the reproductive biology, growth, and development of 82 fishers (Martes pennanti) between 1990-1993. Males (Subjects--Topical Terms:

783690
Agriculture, Forestry and Wildlife.

Reproductive biology of captive fishers.
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035 $a (UnM)AAI9513263
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100 1 $a Frost, Herbert C. $3 1914680
245 1 0 $a Reproductive biology of captive fishers.
300 $a 126 p.
500 $a Source: Dissertation Abstracts International, Volume: 56-01, Section: B, page: 0013.
500 $a Adviser: William B. Krohn.
502 $a Thesis (Ph.D.)--The University of Maine, 1994.
520 $a I studied the reproductive biology, growth, and development of 82 fishers (Martes pennanti) between 1990-1993. Males ( $> $6 months of age) were nonreproductive from June through January based on regressed testes. Testosterone levels and testes size increased in January and reached a maximum in March whereas, sperm production was at its maximum from March through May. Testosterone levels decreased, testes were regressed, and sperm production ceased by June. Adult females ( $> $2 years old) were anestrus from June through March and vaginal cornification remained high for 3 to 5 weeks after the birth of kits (x birth date = 23 March, n = 14).
520 $a Laparotomies were performed on adult females ( $> $2 years old) that gave birth to evaluate placental scar visibility and nipple size was measured on all females throughout the year. One placental scar was found in 1 of 14 females that gave birth. Nipple size for nonbreeders remained small throughout the year but increased slightly during the breeding season in former breeders. Nipple size for current breeders was larger than all other classes. No overlap occurred in 95% confidence intervals between current breeders and nonbreeders. Placental scars appear unreliable as an estimator of parturition whereas, nipple enlargement is a useful measure of parturition.
520 $a The gestation period of fishers was $> $1 0 months, but active embryo development was $< $4 5 days (n=21). The appearance and development of embryos were monitored with ultrasound. Biparietal and body diameters of fetuses were accurate predictors of parturition dates as early as 23 days prepartum.
520 $a Maternal body mass and litter size were positively correlated (r $\ sp2 $ = 0.33, P = 0.048). There was also a positive correlation between the number of kits born alive and the ratio of litter size to maternal size (r $\ sp2 $ = 0.59, P = 0.009). Fishers were born altricial and remained so until their eyes and ears opened at approximately 48 days of age. After their eyes opened and they began to eat solid food, body size increased rapidly as did other morphological and behavioral traits. Body mass was similar for males (n = 22) and females (n = 16) at birth, but by 90 days of age the mean daily gain of males was twice that of females. Kits were weaned as early as 68 days of age, corresponding to the time wild kits leave natal dens.
590 $a School code: 0113.
650 4 $a Agriculture, Forestry and Wildlife. $3 783690
650 4 $a Biology, Zoology. $3 1018632
650 4 $a Agriculture, Animal Culture and Nutrition. $3 1017857
690 $a 0478
690 $a 0472
690 $a 0475
710 2 0 $a The University of Maine. $3 1029373
773 0 $t Dissertation Abstracts International $g 56-01B.
790 1 0 $a Krohn, William B., $e advisor
790 $a 0113
791 $a Ph.D.
792 $a 1994
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9513263