Reproductive traits, behavioral and hormonal changes during breeding season in Egyptian Geese under natural photoperiod

2021 ◽  
Author(s):  
Azhar F. Abdel Fattah ◽  
Noura E. Abd Elhameed ◽  
Elshimaa M. Roushdy ◽  
Mohamed S. El Kholy ◽  
Mahmoud Alagawany
Keyword(s):  
Breeding Season ◽  
Reproductive Traits ◽  
Hormonal Changes ◽  
Natural Photoperiod

Female reproductive characteristics of the Balkan wall lizard (Podarcis taurica) in the northwestern periphery of its range

2010 ◽  
Vol 5 (3) ◽  
pp. 391-395 ◽  
Author(s):  
Katarina Ljubisavljević ◽  
Georg Džukić ◽  
Miloš Kalezić
Keyword(s):  
Body Size ◽  
Clutch Size ◽  
Breeding Season ◽  
Egg Size ◽  
Reproductive Traits ◽  
Species Range ◽  
Trade Off ◽  
Female Body Size ◽  
Female Reproductive Traits ◽  
Gravid Females

AbstractWe present data on the female reproductive traits of the Balkan wall lizard in the Deliblato Sand, a large continental sandland in the Pannonian area in the northwestern periphery of the species range. The clutch and egg characteristics of the population were investigated on the basis of clutches laid in laboratory conditions by gravid females captured in one locality. Balkan wall lizards produced at least two clutches in a breeding season. Individual females laid clutches of commonly two (range 1–4) eggs. The female body size had no effect on clutch and egg size. There was no trade-off between egg size and clutch size.

Duration of melatonin treatment and ovarian activity in ewes

1988 ◽  
Vol 1988 ◽  
pp. 92-92
Author(s):  
S. Wigzell ◽  
J.J. Robinson ◽  
J.M. Wallace ◽  
R.P. Aitken
Keyword(s):  
Breeding Season ◽  
Ovarian Activity ◽  
Similar Reaction ◽  
Melatonin Treatment ◽  
Oral Dosing ◽  
Starting Time ◽  
Highly Effective ◽  
Natural Photoperiod ◽  
The Mean

Daily oral dosing in mid afternoon with 3 mg of the indoleamine, melatonin, from early June onwards is highly effective in advancing the breeding season of both Greyface and Scottish Blackface ewes kept under a natural photoperiod; the mean reaction interval from initial dosing to the onset of ovarian activity in Scottish Blackface ewes being around 65 days compared with 110 days for untreated controls (Robinson et al 1985). Advancing the starting time for the melatonin treatment to mid-March gave a similar reaction interval with behavioural oestrus occurring in late May/early June (Wigzell et al 1986a). Following this reversal of the breeding season by melatonin, continued melatonin treatment in unmated ewes resulted in a period of oestrous cyclicity lasting 4 to 5 months. Thereafter the ewes became refractory to melatonin and returned to anoestrus at a time when untreated controls were commencing ovarian activity (Wigzell et al 1986b). These observations prompted us to investigate the effects of different durations of melatonin treatment on ovarian activity.

scholarly journals Role of FSH, numbers of FSH receptors and testosterone in the regulation of inhibin secretion during the seasonal testicular cycle of adult rams

Reproduction ◽  
2002 ◽  
pp. 269-280 ◽  
Author(s):  
LM Sanford ◽  
CA Price ◽  
DG Leggee ◽  
SJ Baker ◽  
TA Yarney
Keyword(s):  
Breeding Season ◽  
Sertoli Cells ◽  
Fsh Receptor ◽  
Relative Importance ◽  
Testosterone Secretion ◽  
Receptor Mrna ◽  
Testicular Recrudescence ◽  
Natural Photoperiod ◽  
Stimulation Of

The regulation of inhibin secretion has not been elucidated fully in male ruminants. The aim of this study was to determine the relative importance of FSH and testosterone concentrations, and FSH receptors, in the control of secretion of immunoactive inhibin in rams. In Expt 1, temporal changes in hormone concentrations and testicular FSH binding were determined for two groups of rams (n = 4) kept under opposite, alternating 4 month periods of long (16 h light:8 h dark) and short (8 h light:16 h dark) days. Testicular biopsies (1-2 g) were collected when the testes were regressed, redeveloping, redeveloped and regressing. In Expt 2, separate groups of rams (n = 4) kept under natural photoperiod (latitude 45 degrees 48 minutes N) were designated as controls or passively immunized (for 3 weeks) with sufficient oestradiol antiserum to increase testosterone secretion without altering LH and FSH; this was done when the testes were regressed (non-breeding season) and redeveloped (breeding season). In both groups of rams (Expt 1), 'seasonal' increases in FSH concentrations began a few weeks earlier than did increases in inhibin concentrations. FSH reached maximum concentrations during testicular recrudescence, whereas numbers of FSH receptors in the testis and circulatory inhibin concentrations did not reach peak values until the testes were fully developed. Numbers of FSH receptors per testis, but not FSH concentration, were positively correlated (r = 0.65) with inhibin concentrations across the four stages of the testicular cycle. Near the end of testicular recrudescence early in the breeding season (Expt 2), relatively high FSH concentration was associated with increased abundance of FSH receptor mRNA (90%) and number of receptors (45%) in the testis and increased inhibin concentrations (50%), compared with when the testes were regressed. Moderate, physiological increases in testosterone secretion in immunized rams did not affect inhibin in either season. These results indicate that: (i) FSH stimulation of immunoactive inhibin secretion by Sertoli cells as testes recrudesce is via increases in secretion (early) and cognate receptors (late); (ii) FSH upregulates the synthesis of its own receptor late in recrudescence; and (iii) the positive correlation (r = 0.70) observed between circulatory testosterone and immunoactive inhibin does not reflect a causal relationship.

Breeding season and ovulation rate in ewes treated with long days in spring followed by a melatonin implant and exposure to a ram

1996 ◽  
Vol 62 (3) ◽  
pp. 507-512 ◽  
Author(s):  
T. Sweeney ◽  
D. O'Callaghan
Keyword(s):  
Breeding Season ◽  
Luteal Phase ◽  
Signal Sequence ◽  
Ovulation Rate ◽  
Continuous Exposure ◽  
Biphasic Response ◽  
Reproductive State ◽  
Serum Progesterone ◽  
Natural Photoperiod ◽  
Median Date

AbstractWhile the onset of the breeding season in ewes can be advanced up to 7 weeks following exposure to long days (44 days) before lambing, a melatonin implant from lambing and exposure to a ram from the summer solstice, this advance is reduced by the absence of a ram. The aim of this experiment was to determine if earlier exposure to the ram and/or exposure to more long days before lambing would further advance the onset of the breeding season. A further aim was to compare the ovulation rate and duration of the breeding season between ewes with a normal and advanced onset of the breeding season due to this treatment regime. Pregnant ewes lambing in mid March were allocated to treatments as follows: (1) controls, maintained on natural photoperiod; (2) 44 LD + mel, exposed to 44 long days (18L: 6D; LD) before lambing followed by a 700-mg melatonin implant after lambing; (3) 90 LD + mel, as in treatment 2, but exposed to 90 LD before lambing; (4) 90 LD + mel + ram, as in treatment 3, including continuous exposure to a vasectomized ram from 10 April. Reproductive state was assessed from serum progesterone concentrations in blood collected at 3- to 4-day intervals from 10 April and ovulation rate was determined during the luteal phase of the first five oestrous cycles in control ewes and ewes exposed to 90 LD + mel + ram. Ewes exposed to 90 LD + mel + ram commenced the breeding season 10 weeks earlier (median date 25 July, range 28 days;P< 0·001) than controls (median date 8 October, range 68 days). Overall, the onset of the breeding season was not advanced in ewes given 44 or 90 LD + mel in the absence of a ram, but a biphasic response was evident, with 40 to 50% of ewes beginning the breeding season at the same time as ewes on 90 LD + mel + ram. Ovulation rate was similar between control ewes and ewes exposed to 90 LD + mel + ram (P > 0·05). The duration of the breeding season was longer in ewes exposed to 90 LD + mel + ram (210 (s.e. 15) days;P< 0·002) than in control ewes (158 (s.e. 10) days), with no difference in date of the end of the breeding season (P > 0·05). Exposure of ewes to 90 LD before lambing in March, followed by a melatonin implant and exposure to the ram from 10 April advanced the onset and extended the duration of the breeding season without an overall effect on ovulation rate. The ram is an important component of this signal sequence.

Breeding Season in Female Cats Acclimated Under a Natural Photoperiod and Interval Until Puberty

2004 ◽  
Vol 66 (9) ◽  
pp. 1129-1132 ◽  
Author(s):  
Toshihiko TSUTSUI ◽  
Kiyoshi NAKAGAWA ◽  
Taichi HIRANO ◽  
Keiichi NAGAKUBO ◽  
Masakazu SHINOMIYA ◽  
...  
Keyword(s):  
Breeding Season ◽  
Natural Photoperiod

Morphometric, productive and reproductive traits of indigenous goose of Bangladesh

2016 ◽  
Vol 59 ◽  
pp. 37-45
Author(s):  
M.F. Islam ◽  
M.M. Mia ◽  
M.A. Rahman ◽  
N. Bhowmik
Keyword(s):  
Breeding Season ◽  
Age Groups ◽  
Reproductive Traits ◽  
The Body ◽  
Least Square ◽  
Bench Mark ◽  
Morphometric Traits ◽  
Significant Difference ◽  
White Type ◽  
Beak Length

Summary The study was aimed to identify, characterize and describe the phenotypic variation of indigenous goose populations in Bangladesh. The research was conducted at Sylhet Sadar Upazilla in Sylhet district and encompassed about 141 geese (74 brown type and 67 white type). Least Square Mean ± SE of body length, wing span, shank length, beak length and head length of mature indigenous goose were 73.47 ± 0.95, 134.53 ± 1.38, 9.27 ± 0.09, 8.88 ± 0.10 and 6.42 ± 0.02 cm, respectively. Males were significantly (p &lt; 0.01) higher than their female counterparts for all morphometric traits but no significant differences (p &gt; 0.05) were found between two types. The body weight of indigenous goose at day old, 2-week, 1-month, 2-month and 10-month of age were 95.45 ± 0.88, 148.59 ± 1.55, 407.34 ± 7.27 gm, 1.19 ± 0.03 kg and 3.65 ± 0.06 kg, respectively. Males were significantly (p &lt; 0.01) heavier than females in all age groups except day old gosling but no significant difference (p &gt; 0.05) were observed for body weights between two types of goose. Egg weight, egg length, egg width, incubation period, clutch size, number of eggs in a breeding season and age at first egg were 131.85 ± 1.70 gm, 7.40 ± 0.02 cm, 5.22 ± 0.02 cm, 30.30 ± 0.07 days, 7.42 ± 0.08, 20.52 ± 0.38 and 313.22 ± 3.03 days, respectively. The number of eggs in a breeding season of brown type were significantly (p &lt; 0.05) higher than that of white type goose. This study provides a bench mark for the morphometric traits and performance of goose in Bangladesh.

scholarly journals Sexual behavior and hormone levels of Kıvırcık ewes after estrus synchronization during and out of the breeding season

2006 ◽  
Vol 49 (6) ◽  
pp. 583-592
Author(s):  
E. E. Ekiz ◽  
M. Ozcan
Keyword(s):  
Sexual Behavior ◽  
Breeding Season ◽  
Sexual Behaviors ◽  
Hormonal Changes ◽  
Head Turning ◽  
Serum Progesterone ◽  
Hormonal Responses ◽  
Group I ◽  
Group Ii ◽  
Observation Period

Abstract. The aim of the study was to investigate the sexual behavior and hormonal changes in Kıvırcık ewes synchronized during and out of the breeding season. Feeding, individual and eliminative behaviors of the ewes were also recorded. Group I ewes were synchronized during the breeding season and Group II ewes were synchronized out of the breeding season. At the end of synchronization protocol, ewes were exposed to Kıvırcık rams (day 0, hour 0) and behavioral observations were started. Jugular blood samples were collected at the end of each observation period. Among sexual behaviors, head-turning and non-firm standing were displayed more frequently than soliciting, anogenital sniffing, sniffing scrotum and firm standing in both groups. Squatting and tail-fanning were not observed regularly. Defecation and sexual behaviors did not differ between groups. Group I displayed more lying (P<0.001), standing (P<0.001), and urination (P<0.001) whereas Group II displayed more eating (P<0.001), rumination (P<0.001), drinking (P<0.01) and walking (P<0.001). Estradiol levels around estrus did not differ between groups and showed a wave like pattern. While serum progesterone was at the basal level before and during estrus, it started to increase at 50 h and reached a level >0.5 ng/ml at 122 h in both groups. Estrus onset was 30.0±1.38 and 26.5±2.27 h, for Group I and II, respectively. Estrus duration was 19.0±2.20 and 18.0±2.86 h, for the same groups, respectively. In conclusion, Kıvırcık ewes synchronized during the anestrous period showed similar behavioral and hormonal responses, as in the breeding season.

scholarly journals VARIATIONS IN AND RELATIONSHIPS BETWEEN REPRODUCTIVE PERFORMANCE AND GROWTH PARAMETERS IN YEARLING BEEF BULLS IN SINGLE-SIRE MATING AT PASTURE

1989 ◽  
Vol 69 (1) ◽  
pp. 39-46
Author(s):  
A. FARID ◽  
M. MAKARECHIAN ◽  
R. T. BERG ◽  
M. A. PRICE
Keyword(s):  
Beef Cattle ◽  
Key Words ◽  
Pregnancy Rate ◽  
Breeding Season ◽  
Reproductive Performance ◽  
Growth Parameters ◽  
Reproductive Traits ◽  
Phenotypic Variance ◽  
Breed Group ◽  
Beef Bulls

Yearling bull fertility, measured as pregnancy rate, percentage of calves born during the first 4 and 6 wk of calving and mean and median of calving date distribution, were studied in 109 single-sire breeding herds of two breed groups over a 10-yr period. The breed groups were Herefords bulls mated to purebred and crossbred Hereford cows, and Beef Synthetic bulls mated to Beef Synthetic cows. The bulls averaged 14 mo old at the start of breeding. The average bull-to-cow ratio was approximately 1:22, and the breeding season started on 1 July each year and extended for 60 d. Two out of 109 bulls (1.8%) were subfertile (less than 50% pregnancy of the herd). The Beef Synthetic, which had crossbred foundation, had significantly higher fertility, calved earlier, had smaller phenotypic variance, and lower year-to-year fluctuation in the reproductive traits than the Hereford. Variations in reproductive performances of bulls of the same breed group used in the same year were much larger than those among different years, the former comprised over 75% of phenotypic variance of the traits in the two breed groups. Relationships between fertility of bulls and their weight and growth parameters were negligible, but bull fertility tended (P < 0.10) to improve with age. Bulls that were heavy at weaning, end of feedlot test and breeding settled their mates earlier during the breeding season. Key words: Beef cattle, yearling bull, fertility

scholarly journals Reproductive performance of Ile de France ewes under dietary supplementation before and during the breeding season

2016 ◽  
Vol 37 (1) ◽  
pp. 269 ◽  
Author(s):  
Luis Gabriel Alves Cirne ◽  
Américo Garcia da Silva Sobrinho ◽  
Maria Emilia Franco Oliveira ◽  
José Carlos Barbosa ◽  
Gabriel Jorge Carneiro de Oliveira ◽  
...  
Keyword(s):  
Breeding Season ◽  
Reproductive Performance ◽  
Body Condition Score ◽  
Reproductive Traits ◽  
Dietary Supplementation ◽  
Concentrate Supplementation ◽  
Management Condition ◽  
Condition Score ◽  
Calving Rate ◽  
Average Body

The aim of this study was to evaluate the reproductive performance of Ile de France ewes undergoing dietary supplementation before and during the breeding season, with and without association with management conditions (pre-mating shearing). Thirty-six ewes with an average body weight of 66 kg were used in the experiment. Treatments involved ewes receiving or not receiving concentrate supplementation (flushing), with groups subdivided according to the management condition to which animals were subjected: shearing or lack of it. Thus, ewes were divided into four treatments: flushed and shorn; flushed and unshorn; unflushed and shorn; and unflushed and unshorn. Flushing increased weight gain and body condition score, and when associated with shearing, it promoted anticipation of estrus. Fertility rate (86.05%), calving rate (77.77%), birth rate (113.83%), and type of birth (single: 82.29% and twin: 17.71%) were not influenced. Birth weight (3.96 kg) and prolificacy (1.25%) also were not affected. Despite the lack of changes in reproductive traits, flushing adopted during the breeding season associated with shearing anticipated estrus in ewes.

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