摘要:

AbstractA non‐surgical uterine flushing technique was employed to recover rhesus monkey preimplantation embryos during April–‐September, a period thought to be associated with reduced fertility. A total of 22 females of proven fertility, maintained indoors under strict light and temperature control, were employed for the study in which 72 menstrual cycles were monitored. The average length of their menstrual cycle was 27.9 ± 3.8 days. The percentages of cycles that showed normal cyclic patterns of estrogen, LH, and sex‐skin color were 84.7%, 91.7%, and 90.3%, respectively. Following natural mating, uterine flushing was performed on days 4–7 of pregnancy. Of 58 attempts, 27 (46.6%) resulted in the recovery of embryonic materials. Two recoveries produced unfertilized oocytes; 20 yielded embryos which were morphologically normal, and 7 yielded damaged and/or degenerate embryos. Luteal function in cycles involving uterine flushings was evaluated by examining ovaries by laparoscopy, ovulation being confirmed in 34 of 35 examinations. Serum progesterone was>2 ng/ml in 39 of 45 cycles. The conception rate of 46.6% noted in this study was similar (P>0.4) to those observed from other natural matings in our colony, either during the same period (49.3%; n = 67) or during October–‐March (46.9%; n = 113). These results show that rhesus monkeys, maintained under appropriate environmental conditions, can experience normal fertile menstrual cycles throughout the summer months, and extend previous observations to demonstrate, for the first time, that preimplantation embryos can be recovered from this species year‐round. © 199

ISSN:0275-2565    

DOI:10.1002/ajp.1350290202

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1993

数据来源: WILEY

摘要:

AbstractThe density of gibbon populations may be estimated by listening for the loud duetted songs of monogamous territorial groups. This method requires a correction factor which must be estimated from the frequency of singing of an adequate number of known study groups. The correction factor and its error were estimated for pileated gibbons (Hylobates pileatus) in Khao Soi Dao Wildlife Sanctuary in southeastern Thailand. Among 30 groups studied, 47% sang per day, on average, but the variation between days and the variation in singing frequency between groups were large. Weather conditions, especially windiness, explained some variation in singing. During an area‐wide survey of groups in the sanctuary, unexplained variation in singing from day to day accounted for approximately half of the sample error of group density estimated from 1‐day listening samples. Error due to day‐to‐day variability can be reduced by listening for more than one day at each site. Correction factors based on the cumulative proportion of groups heard during longer (2–5‐day) sample periods of listening were closer to 1.0, therefore leaving less room for error and bias of the correction factor. © 1993 Wil

ISSN:0275-2565    

DOI:10.1002/ajp.1350290203

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1993

数据来源: WILEY

摘要:

AbstractSquirrel monkeys exchange chuck vocalizations in antiphonal sequences that suggest a request for information, and a response to that request. Chucks are characterized by measurable acoustic differences, notably in peak frequency, related to their position in a sequence. To determine the cues by which animals might identify a chuck that is a request for information from one that is a response, first‐in‐sequence (α) and second‐in‐sequence (β) chucks, differing in peak frequency, were recorded from familiar individuals and strangers. These chucks, and a sham control, were played back, in the temporal context of a first‐in‐sequence call, to a target group of socially housed captive squirrel monkeys.Animals responded more strongly to α chucks than to β chucks for calls originating from familiar individuals. No distinction was made between the α and β chucks of strangers, and all strangers' chucks got a weaker response than did familiar α chucks. Squirrel monkeys probably use acoustic differences, rather than context, to discriminate the ordinal significance of a chuck, but cannot do so unless they are familiar with the caller. © 1

ISSN:0275-2565    

DOI:10.1002/ajp.1350290204

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1993

数据来源: WILEY

摘要:

AbstractA set of simple standards has been developed to ease the task of transferring primate colony data between institutions and computers, and to assure that colony vital statistics are appropriate for demographic and genetic analyses. The standards have been designed to be easily and inexpensively implemented from existing databases, and also may serve as a guide to the setup of new colony record‐keeping systems. © 1993 Wiley‐Liss,

ISSN:0275-2565    

DOI:10.1002/ajp.1350290205

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1993

数据来源: WILEY

摘要:

AbstractA total of 12 free‐ranging muriquis (Brachyteles arachnoides) were captured with Telazol® at Fazenda Esmeralda, Minas Gerais, Brazil, and at Fazenda Barreiro Rico, São Paulo, Brazil. All animals were measured, marked, weighed, and released. Previously reported data suggested that Brachyteles is a sexually dimorphic species with female‐male body weights of 12–15 kg, respectively. We found no statistically significant difference in body weight between females (mean = 8.4 kg, range = 6.9–9.3 kg, n = 4), and males (mean =9.6 kg, range = 9.3–10.2 kg, n = 4). Our results are at variance with previously published body weights in the literature. Larger sample size may reveal a significant sexual difference, particularly in body weight. © 1993 Wil

ISSN:0275-2565    

DOI:10.1002/ajp.1350290206

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1993

数据来源: WILEY

ISSN:0275-2565    

DOI:10.1002/ajp.1350290207

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1993

数据来源: WILEY

ISSN:0275-2565    

DOI:10.1002/ajp.1350290208

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1993

数据来源: WILEY

ISSN:0275-2565    

DOI:10.1002/ajp.1350290201

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1993

数据来源: WILEY