Reproduction in the mosaic-tailed rat, Melomys cervinipes (Rodentia :Muridae)

1970 ◽  
Vol 18 (2) ◽  
pp. 171 ◽  
Author(s):  
JM Taylor ◽  
BE Horner
Keyword(s):  
Litter Size ◽  
Reproductive Performance ◽  
Post Partum ◽  
Selective Advantage ◽  
Breeding Period ◽  
Mode Of Reproduction ◽  
Accessory Sex Glands ◽  
Modest Contribution ◽  
Northern Regions ◽  
Autumn And Winter

The mosaic-tailed rat, M. cervinipes, is usually an abundant murid where it occurs in the northern regions of Australia. It is an inhabitant of the forests and their fringe associations and is semi-arboreal. Although the annual reproductive performance is unknown, breeding occurs at least in late spring and summer in more southern areas of its distribution and extends into autumn and winter farther north. Litter size ranges from two to four. The nipple-clinging behaviour of the young appears to be of selective advantage as an escape mechanism. Description of the histology of the gonads and accessory sex glands is given for juveniles, breeding adults, and sexually quiescent adults. M. cervinipes is polyoestrous and a spontaneous ovulator and may experience a post-partum oestrus. Melomys is not known to occur in plague proportions in its native habitat; its mode of reproduction favours a prolonged and modest contribution of young within a breeding period.

13 THE RELATIONSHIP BETWEEN EARLIER POSTPARTUM CYCLICITY AND SUBSEQUENT REPRODUCTIVE PERFORMANCE IN DAIRY COWS: A FIELD TRIAL

2011 ◽  
Vol 23 (1) ◽  
pp. 113
Author(s):  
I. H. Kim ◽  
H. C. Lee ◽  
H. G. Kang
Keyword(s):  
Dairy Cows ◽  
Body Condition ◽  
Reproductive Performance ◽  
Body Condition Score ◽  
Post Partum ◽  
Management Program ◽  
Breeding Period ◽  
Chi Square ◽  
Logistic Analysis ◽  
The Relationship

Earlier postpartum cyclicity based on hormonal analysis was related to the subsequent fertility, although it has not been clarified under field conditions. This field study examined the relationship between the detection of corpus luteum (CL) at the first post partum month and subsequent reproductive performance in dairy cows. Holstein dairy cows underwent ultrasonography (Sonoace 600 with 7.5 MHz linear-array transducer; Medison Co. Ltd., Korea) at 30 (±7) days postpartum to determine the existence of CL in ovaries and then divided into 2 groups based on the existence of CL; the CL group (n = 156) or the non-CL group (n = 281). At the same time of ultrasonography, all cows were scored for body condition. Cows received the normal herd reproductive management program including oestrous detection or synchronization, or synchronization of ovulation in the breeding period. Pregnancy was determined per rectum 60 days after artificial insemination by both ultrasonography and palpation. Reproductive performance data were collected for a minimum of 210 days postpartum. Reproduction data between the CL and non-CL groups were evaluated by t-test, chi-square test, or logistic regression using an SAS program (Version 9.1: SAS Institute, Inc., Cary, NC, USA). The proportion of cows with CL in ovaries at 30 (±7) days postpartum was 35.7% of all cows. The number of days to first insemination after calving was more delayed (P < 0.0001) in the non-CL group (100.1 ± 2.7 days) than in the CL group (80.9 ± 2.9 days), while the pregnancy rate to first insemination did not differ (P > 0.05) between the CL group (44.2%) and the non-CL group (45.9%). The CL group had higher pregnancy proportions (PP) within 60 (odds ratio, OR = 2.3; P = 0.0063), 90 (OR = 1.6; P = 0.04), and 120 days (OR = 1.5; P = 0.05) postpartum than the non-CL group; however, the PP within 150 or 210 days postpartum did not differ between the 2 groups (P > 0.05). Besides, logistic analysis revealed that cows with body condition score (BCS) ≥3.00 were more likely to have CL (OR = 1.8; P = 0.015) compared with cows with BCS ≤ 2.75, while primiparous cows were less likely to have CL (OR = 0.6; P = 0.0085) compared with multiparous cows. In addition, cows that underwent ultrasonography later than 30 days postpartum were more likely to have CL (OR = 1.6; P = 0.0192) compared with cows that underwent ultrasonography earlier. In conclusion, the earlier cyclicity based on the detection of CL using ultrasonography at the first postpartum month, which might be in part due to a higher BCS, predicts an enhanced reproductive performance in dairy cows, particularly during the early and early-mid lactations. This work was supported by the research grant of the Chungbuk National University in 2010.

Studies in sow reproduction 1. The effect of nutrition between weaning and remating on the reproductive performance of primiparous sows

1972 ◽  
Vol 15 (3) ◽  
pp. 259-264 ◽  
Author(s):  
P. H. Brooks ◽  
D. J. A. Cole
Keyword(s):  
Litter Size ◽  
Reproductive Performance ◽  
Post Partum ◽  
Large White ◽  
The Mean ◽  
Sow Reproduction

SUMMARYFollowing weaning of their first litter at 42 days post partum, 36 Landrace × (Landrace × Large White) sows were fasted for 24 hr then allocated to one of three feed levels, 1·8, 2·7 and 3·6 kg food/day, until the day after mating. During pregnancy all the sows received 1·8 kg food/day.The incidence of infertility and anoestrus was greatest for sows fed 1·8 kg/day and least for sows fed 3·6 kg·day. Sows fed 1·8 kg/day took significantly (P < 0·01) longer (21·6 + 3·0 days) to return to oestrus than sows fed 3·6 kg/day (9·2 ± 2·2 days). The mean litter size for sows fed 1·8, 2·7 and 3·6 kg food/day was 9·4 ± 0·9, 10·1 ± 0·8 and 11·5 ± 0·6 piglets respectively, but these differences were not significant.

Oestrous and ovarian activities of Finn-cross ewes during the post-partum and the seasonal anoestrous periods

1984 ◽  
Vol 103 (1) ◽  
pp. 155-160 ◽  
Author(s):  
D. Amir ◽  
Miriam Rosenberg ◽  
H. Schindler
Keyword(s):  
Sexual Activity ◽  
Reproductive Performance ◽  
Post Partum ◽  
Oestrous Cycle ◽  
Ovarian Activity ◽  
Plasma Progesterone ◽  
Oestrus Induction ◽  
Autumn And Winter

SummaryThe seasonal and post-partum oestrus occurrence and ovarian activity, assessed by the plasma progesterone concentrations, were studied in Finn-cross ewes following autumn and winter lambings.The last seasonal oestrous cycle was followed by a silent ovulation in C0% of the Finn × Awassi ewes. Silent ovulations during midanoestrus occurred in 50% of the ewes, and in 90% of the animals a silent ovulation preceded the normal resumption of the seasonal sexual activity.The first post-partum oestrus occurred within C0 days after October lambings in about 90% of the ewes. Silent ovulations before the first post-partum oestrus were evident in 70% of the recycling ewes.It is suggested that breeding ewes with ovarian activity after oestrus induction during anoestrous periods might increase the reproductive performance of the flock in a frequent lambing system.

Concurrent lactation and reproductive performance in CFLP mice mated post partum

1981 ◽  
Vol 15 (3) ◽  
pp. 273-275 ◽  
Author(s):  
M. L. Norris ◽  
C. E. Adams
Keyword(s):  
Litter Size ◽  
Reproductive Performance ◽  
Post Partum ◽  
Gestation Length

Fertility of nursing CFLP mice mated post partum was high (87%) and unaffected by the number of young suckled. Gestation length and litter size were positively correlated with the number of young nursed.

EFFECTS OF UTERINE INFUSION OF NONVIABLE SEMEN, SEMINAL PLASMA OR EGG ALBUMEN PRIOR TO BREEDING ON THE REPRODUCTIVE EFFICIENCY OF GILTS OR SOWS

1990 ◽  
Vol 70 (1) ◽  
pp. 129-133 ◽  
Author(s):  
J. R. GILES ◽  
L. H. THOMPSON ◽  
S. ARKINS ◽  
T. CAMACHO ◽  
P. A. EICHEN
Keyword(s):  
Litter Size ◽  
Seminal Plasma ◽  
Reproductive Performance ◽  
Artificial Insemination ◽  
Post Partum ◽  
Pregnancy Rates ◽  
Reproductive Efficiency ◽  
Corpora Lutea ◽  
Treatment Groups ◽  
Egg Albumen

In two different experiments crossbred gilts and(or) sows were used to investigate the effects of uterine exposure (prior to breeding) to nonviable semen (NS), seminal plasma (SP) or egg albumen (EA) on reproductive performance. Treatment solutions were infused via the cervix at estrus in gilts or within 2 d post-partum in sows. Females were artificially inseminated at the subsequent estrus. In the first experiment pregnancy rates for gilts infused with Beltsville Thawing Solution (BTS) as controls, NS or EA and subsequently inseminated, were 76, 85 and 54%, respectively, and were not significantly different among treatment groups. The number of total embryos (adjusted for number of corpora lutea) present at 38 d postinsemination was 9.6, 9.0 and 9.6, respectively, for BTS, ND and EA infused gilts and was not significantly different. Likewise, the number of live and dead embryos was not different among treatments. In the second experiment, the proportions of inseminated sows infused with BTS, NS or SP that subsequently farrowed were 87, 84 and 92%, respectively, and did not differ significantly among treatments. No significant differences were detected for the number of total, live or dead pigs born per litter among treatments. We conclude that uterine exposure to seminal proteins or egg albumen prior to breeding does not alter reproductive performance in gilts by 38 d of gestation. Also, the infusion of seminal proteins in sows shortly after parturition does not affect pregnancy rates or litter size at the subsequent farrowing. Key words: Reproductive efficiency, litter size, swine, artificial insemination

scholarly journals THE EFFECT OF DIFFERENT LEVELS OF DRY SEASON SUPPLEMENTARY FEEDING ON THE REPRODUCTIVE PERFORMANCE OF YANKASA SHEEP IN A TWICE-YEARLY LAMBING PROGRAMME

2021 ◽  
Vol 14 ◽  
pp. 41-49
Author(s):  
O. A. Osinowo ◽  
M. S. Doma ◽  
N. Pathiraja ◽  
V. Buvanendran
Keyword(s):  
Birth Weight ◽  
Litter Size ◽  
Reproductive Performance ◽  
Post Partum ◽  
Dry Season ◽  
Supplementary Feeding ◽  
Northern Nigeria ◽  
Consistent Increase ◽  
Different Levels

Ninety-four pregnant Yankasa ewes were divided into 3 groups and fed;(1) 0, (2) 200 or (3) 400 g/head/day of a concentrate supplement in addition to 6 h grazing daily, from 35.9±2.0 days before, to 98. 122.0 days after lambing in the dry season between 2 Jan vary and 15 May 1984 in Zaria, Northern Nigeria. There were no significant differences (P>0.05) bet den groups in litter size and adjusted birth weight in the initial lambing 35.9±2.0 days into the experiment although the latter showed consistent increase with level of supplementation. Adjusted 90-day Weaning weights increased significantly (P<0.05) with each increase in level of supplementation: 5:5, 7.1 and 8.6kg for groups 1, 2 and 3 respectively. Correspondingly, the percentage of lambs weaned increased (48.6, 56.4 and 90.7%) while ewe mortality declined (12.9, 10.0 and 3.0%) with increasing level of supplementation, The percentage of ewes exhibiting oestrus within 98.1±2.0 days postpartum increased with level of supplementation: 77,8,91.3 and 96.8% for groups 1, 2 and 3 respectively. However, of the ewes showing oestrus, there were no significant differences between groups in post-partum intervals to oestrus and conception. Litter size from matings during the experiment showed non-significant increase with level of supplementation. It is concluded that dry season supplementary feeding is essential for optimum reproductive performance of Yankasa sheep in a twice-yearly lambing programme. 

Effect of altrenogest on litter size in primiparous sows

1990 ◽  
Vol 1990 ◽  
pp. 171-171
Author(s):  
D.J. Baker ◽  
A.R. Peters ◽  
G. Gettinby
Keyword(s):  
Litter Size ◽  
Reproductive Performance ◽  
Post Partum ◽  
Animal Health ◽  
Ovarian Cycle

Aitrenogest (17 α -allyl-17-hydroxyestra-4,9,11-trien-3-one; Regumate Porcine; Hoechst Animal Health) is a synthetic progestagen which has been used to control and synchronise the ovarian cycle particularly in cyclic gilts. However progestagens have also been used in various species to induce and synchronise the first ovulation post partum. The present study was undertaken to determine the effect of altrenogest treatment on the reproductive performance of primiparous sows.

scholarly journals The feeding and breeding of laboratory animals. VI. The breeding of mice

1947 ◽  
Vol 45 (4) ◽  
pp. 420-430 ◽  
Author(s):  
H. M. Bruce
Keyword(s):  
Sex Ratio ◽  
Litter Size ◽  
Reproductive Performance ◽  
Post Partum ◽  
Statistical Analyses ◽  
Gestation Period ◽  
Laboratory Animals ◽  
One Year ◽  
Intensive Breeding

1. The total reproductive performance of two groups each of twenty-four mice over a period of one year under two different systems of mating has been recorded.2. In the first system (monogamous pairs) the male was kept continuously with the female; in 78% of cases the females became pregnant again at post-partum oestrus and were thus subjected for the most part to unbroken intensive breeding.3. In the second system (polygynous groups) several females were kept with one male and were removed to individual cages for the birth and rearing of the litters and were returned to the male again only after the litter had been weaned.4. Under the first system 1149 young were successfully reared to weaning in one year by the twenty-four females; under the second system 559 young were weaned during the same period.5. Mortality of breeding females, litter size, weight of young at weaning, the effect of parity, loss of litters and of young between birth and weaning and the sex-ratio of the young weaned were alike for both methods of mating.6. The interaction of concurrent gestation and lactation upon the length of the gestation period is discussed, and regression lines showing the relation between the number of young suckled, the number of young in the uterus and the length of the gestation period are given.My best thanks are due to Dr A. S. Parkes, F.R.S., for advice during the course of the work and for help in the preparation of the manuscript. I should also like to thank Dr C. W. Emmens for the statistical analyses and the calculation of the regression lines.

A note on the effects of 72-hour calf removal and/or bull exposure upon post-partum reproductive performance of angus cows

1990 ◽  
Vol 50 (1) ◽  
pp. 202-206 ◽  
Author(s):  
J. J. Bonavera ◽  
G. C. S. Schiersmann ◽  
R. H. Alberio ◽  
J. Mestre
Keyword(s):  
Body Condition ◽  
Reproductive Performance ◽  
Post Partum ◽  
Early Summer ◽  
Breeding Period ◽  
Short Term ◽  
Blood Samples ◽  
Good Body Condition ◽  
Calf Removal ◽  
Natural Service

The objective of the present study was to determine whether short-term calf removal (SCR) and/or bull exposure (BE) could improve post-partum reproductive performance. The trial was conducted during the spring and early summer when forage availability was optimum. Sixty-four Angus multiparous cows in good body condition were allotted according to a 2 × 2 factorial design involving SCR and BE. At 33 days post partum calves were removed for 72 h from the SCR and SCR + BE groups, and a vasectomized bull was introduced to the BE and SCR + BE groups and remained with the cows until the end of the experiment. Oestrous detection was performed daily based only on the homosexual behaviour of the cows. Cows were bred by natural service by two fertile bulls. Blood samples for progesterone analysis were collected alternatively every 3 and 4 days from 26 to 120 days post partum. There were no significant differences (P > 0·05) among groups in the ovulation, oestrus, and pregnancy rates during the breeding period, in conception rates, nor in the intervals from calving to first ovulation, to first oestrus, and to conception. Under the conditions of this experiment 72 h calf removal and/or bull exposure did not improve post-partum reproductive performance.

scholarly journals Pemanfaatan Ekstrak Hipofisis Sapi untuk Memperbaiki Performans Reproduksi Induk Babi Post Partum (UTILIZATION OF CATTLE HYPOPHYSIS EXTRACT TO IMPROVE REPRODUCTIVE OF POST PARTUM SOWS)

2017 ◽  
Vol 18 (3) ◽  
pp. 383
Author(s):  
Tree May Thiessen Outang ◽  
Wilmientje Marlene Nalley ◽  
Thomas Mata Hine
Keyword(s):  
Body Weight ◽  
Milk Production ◽  
Litter Size ◽  
Reproductive Performance ◽  
Saline Solution ◽  
Post Partum ◽  
Group Iv ◽  
Conception Rate ◽  
Group Iii ◽  
Group I

This study aimed to evaluate study the influence of cattle hypophysis extract (HE) on the reproductive performance of post partum sows. Twenty landrace sows, 45 days after partum were divided into four groups, five sows each. All were injected with HE intramuscularly. Group I (P0) was injected with 3 ml of saline solution, Group II (P1) was injected with 3 ml contain of 10 mg/EH/Kg body weight (BW), Group III (P2) was injected with 3 ml contain of 20 mg/EH/Kg BW, Group IV (P3) was injected with 3 ml contain of 40 mg/EH/Kg BW. Every sows that showed the estrus symptom were inseminated artificially on the second days, twice each in the morning and evening. The intensity of estrus, length of estrus, number of service preconception (S/C), conception rate (CR), litter size, weight of piglet and milk production were recorded. The result showed that the score of estrus intensity in Group I, II, III and IV were 1.40; 2.40; 2.80 and 2.80 respectively with the length of estrus in each group were 4.40; 5.00; 5.00; 5.60 days respectively. The number of service in Group I, II, III and IV of each pregnancy were 4.40; 1.40; 1.00 and 1.20 with the CR were 0; 60; 100; and 80% respectively. The litter size produced of Group I, II, III and IV were 4.00; 6.00; 10.60; 8.40 respectively. The average of piglet body weight of Group I, II, III and IV were 1.20; 1.36; 1.56 and 1.35 kg respectively. The milk production of each sows of Group I, II, III and IV were 13; 41; 93; 88 g respectively. It can be concluded that cattle hypophysis extract improves the performance of post partum sows with the best level was 20 mg EH/kg of body weight. ABSTRAK Penelitian ini bertujuan mempelajari pengaruh pemberian ekstrak hipofisis terhadap performans reproduksi induk babi betina post partum. Penelitian ini menggunakan 20 ekor induk babi betina jenis landrace, dibagi kedalam empat kelompok perlakuan masing-masing terdiri atas lima ekor induk babi. Babi betina yang baru 45 hari menyapih anaknya diinjeksi dengan ekstrak hipofisis (EH) secara intramuskuler. Kelompok I (P0) diinjeksi dengan 3 mL NaCl fisiologis; Kelompok II (P1) diinjeksi dengan 3 mL NaCL mengandung 10 mg EH/kg bobot badan (BB); Kelompok III (P2) diinjeksi dengan 3 mL NaCl mengandung 20 mg EH/kg BB: Kelompok IV (P3) diinjeksi dengan 3 mL NaCl mengandung 20 mg EH/kg BB. Setiap induk babi yang menunjukkan gejala estrus diinseminasi pada hari kedua dengan interval dua kali, pagi dan sore. Peubah yang diamati adalah intensitas estrus, lama estrus, jumlah perkawinan per kebuntingan (S/C), angka konsepsi (conception rate/CR), litter size, bobot lahir anak, dan produksi susu. Hasil penelitian menunjukkan skor intensitas estrus kelompok I, II, III, dan IV masing-masing 1,40; 2,40; 2,80; 2,80 dengan lama estrus masing-masing kelompok secara berturut-turut 4,40; 5,00; 5,00; 5,60 hari. Nilai S/C masing-masing adalah 4,40; 1,40; 1,00; 1,20 dengan CR masing-masing 0; 60; 100; dan 80%. Total jumlah anak yang dihasilkan kelompok I, II, III, dan IV masing-masing adalah 4,00; 6,00; 10,60; dan 8,40 ekor. Rataan bobot lahir anak per ekor pada kelompok I; II; III; dan IV masing-masing adalah 1,20; 1,36; 1,56; dan 1,35 kg. Produksi susu per induk pada kelompok I, II, III, dan IV masingmasing adalah 13; 41; 93, dan 88 g. Simpulan dari penelitian ini adalah ekstrak hipofisis dapat meningkatkan performans induk babi post partum. Dosis terbaik adalah 20 mg EH/kg BB.

Sign in / Sign up

Export Citation Format

Share Document