Effect of treatment with melatonin implants in conjunction with teaser rams on the reproductive performances of Poll Dorset x Merino ewes joined in early summer in the south-west of Western Australia

1992 ◽  
Vol 32 (8) ◽  
pp. 1045 ◽  
Author(s):  
KP Croker ◽  
MA Johns ◽  
AH Williams ◽  
SR McPhee ◽  
LD Staples
Keyword(s):  
Reproductive Performance ◽  
Reproductive Activity ◽  
Early Summer ◽  
The Other ◽  
Control Group ◽  
Melatonin Treatment ◽  
South West ◽  
Effect Of Treatment ◽  
First Time ◽  
Teaser Rams

Melatonin pretreatment to improve the reproductive performance of first-cross Poll Dorset x Merino ewes joined in early summer was investigated in 2 experiments conducted in consecutive years. In experiment 1, melatonin pellets were administered subcutaneously to 1 of 3 groups of ewes; 14 days later they were joined with testosterone-primed wethers ('teasers'), followed after 15 days by entire rams (melatonin-teased group). The other groups were untreated and teased only. Experiment 2 consisted only of teased and melatonin-teased groups, with the ewes from experiment 1 being reallocated, as well as maiden ewes being joined for the first time. In this experiment melatonin pellets were inserted 38 days before the start of joining. Treatment with melatonin resulted in increased reproductive performances. The responses were characterised by an earlier (P<0.05) conception pattern in both experiments and higher (P<0.001) lambing percentages than controls in experiment 1. Up to 22% more lambs were born to melatonin-teased ewes than to teased ewes, and stimulatory effects were similar for ewes of different ages. In experiment 2, ewes that had received melatonin in both experiments tended (P>0.05) to have higher lambing percentages than teased ewes (up to 17% more lambs born), while ewes that had received melatonin in only experiment 1 tended (P>0.05) to have lower lambing percentages than ewes that were not treated with melatonin in either experiment (4-11%). The higher lambing performances of the melatonin-treated ewes were independent of ewe liveweights. Reproductive activity was also stimulated by the use of teasers alone in experiment 1. Conception patterns were advanced (P<0.01) and there was a trend for more (P>0.05) lambs to be born in the teased group than in the control group. The results show that both teasers and melatonin treatment will advance the conception patterns of first-cross Poll Dorset x Merino ewes joined in early summer, but the melatonin treatment also stimulated fecundity.

scholarly journals Impact of treatment with anti-parasitic (Ivermectin) during prepartum period on mastitis and postpartum reproductive efficiency measurements in Egyptian Baladi cows

2021 ◽  
Author(s):  
Ahmed Ismail Damarany
Keyword(s):  
Incidence Rate ◽  
Reproductive Performance ◽  
The Other ◽  
Occurrence Rate ◽  
Reproductive Efficiency ◽  
Control Group ◽  
Current Investigation ◽  
Live Body Weight ◽  
Effect Of Treatment ◽  
Incident Rate

Abstract The current investigation was designed to determine the effect of treatment with anti-parasites (Ivermectin) on mastitis and postpartum reproductive efficiency measurements in Egyptian Baladi cows. Twenty-four of the cows included in this study were split into two groups. The first group (n = 12 cows) was injected two months prepartum with two doses (15 days inter-treatment) of IVOMEC® Plus solution subcutaneously behind the shoulder, 1ml/50kg live body weight as prescribed by the manufacturer, whilst the other group (n = 12 cows) was used as a control group. The present results revealed that the incident rate of mastitis in treated cows’ group was significantly (P < 0.05) lower (16.7%) than control cows’ group (41.7%). The conception rate in treated cows’ group was significantly (P < 0.05) higher (66.7%) compared with (33.3%) in control group. The time from calving to conception in treated cows was significantly (P < 0.05) lower 86.5 ± 11.4 days compared to 123.3 ± 13.2 days in the control group. The occurrence rate of anestrous cases was significantly (P < 0.05) lower (8.3%) in treated cows than (control group) (25%). In conclusion, the current study indicates there is an association between treated cows with anti-parasites (Ivermectin) two months prepartum and incidence rate of mastitis addition an improvement in the reproductive performance in treated cows relative to untreated cows. Therefore, the current study recommends the herdsmen treats their cows with anti-parasites (Ivermectin) during the prepartum period for less mastitis incidence rate and better reproductive efficiency.

The effect of deworming naturally infected heifers on liveweight gain, reproductive performance and fecal egg counts

1993 ◽  
Vol 73 (2) ◽  
pp. 287-293
Author(s):  
S. L. Boyles ◽  
L. J. Johnson ◽  
W. D. Slanger ◽  
B. J. Kreft ◽  
J. D. Kirsch
Keyword(s):  
Key Words ◽  
Reproductive Performance ◽  
Fecal Sample ◽  
Average Daily Gain ◽  
Treated Group ◽  
The Other ◽  
Control Group ◽  
Age At Puberty ◽  
Daily Gain

Twenty-six of 52 heifers with an average liveweight of 318 kg were dewormed by intraruminal injection of oxfendazole and placed in drylot on 31 January. The other 26 animals served as controls. All heifers were pastured starting on 14 June and the treatment heifers were dewormed in the same manner as at the start of the experiment (31 January) on 1 July and 31 July. The groups started out with similar total worm eggs per gram of fecal sample, but the dewormed heifers had fewer counts each month thereafter. The drylot average daily gain of the treated heifers was higher (P = 0.01) and less variable (P = 0.12) and by 29 May these animals were heavier by 11.7 kg (P = 0.10). The treated animals did not gain as fast on pasture (P = 0.20), but the gain continued to be less variable (P = 0.09). Age at puberty was not different. Number of open heifers in the treated group was 4 vs. 15% for the control group (P = 0.18). Deworming by intraruminal injection resulted in faster feedlot gains, more uniform gains during both drylot and pasture, reduced parasites and no abscess at injection sites. Key words: Anthelmintics, oxfendazole, cattle, heifers

Protogeometric Vases from Amorgos in the Museum of the British School

1989 ◽  
Vol 84 ◽  
pp. 177-185
Author(s):  
R.W.V. Catling ◽  
R.E. Jones
Keyword(s):  
Chemical Analysis ◽  
Early History ◽  
The Other ◽  
The South ◽  
South West ◽  
British School ◽  
History Of ◽  
First Time

Two vases, a cup and an oinochoe, from Arkesine in south-west Amorgos are published for the first time. It is argued that both are probably Middle Protogeometric, one an import from Euboia, the other from the south-east Aegean; chemical analysis supports both attributions. Their implications for the early history of Amorgos are discussed.

Reproductive performance and growth of Shorthorn purebred and crossbred cows

1971 ◽  
Vol 13 (1) ◽  
pp. 7-14 ◽  
Author(s):  
M. H. Fahmy ◽  
G. Lalande ◽  
M. Hidiroglou
Keyword(s):  
Birth Weight ◽  
Reproductive Performance ◽  
The Other ◽  
Crossbred Cows ◽  
Other Hand ◽  
Body Weights ◽  
Calf Mortality ◽  
First Time ◽  
Maximum Body

SUMMARYData were obtained from 27 pure Shorthorn, 22 Angus × Shorthorn, 31 Charolais × Shorthorn and 27 Hereford × Shorthorn cows, during 10 years. Angus × Shorthorn cows required the least number of services per conception (1·17), had the shortest average gestation lengths (280·6 days), and had a calving percentage of 88·2% and birth weight of calf of 29·8 kg. The respective figures for Charolais × Shorthorn were 1·21 services, 281·6 days, 88·3% (the highest) and 32·9 kg (the heaviest), for Hereford × Shorthorn 1·23 services, 283·6 days, 84·4% and 31·6 kg, and for pure Shorthorn 1·20 services, 282·2 days, 82·7% and 29·6 kg. Average calf weight at birth increased with the advance in age of cow up to 5 years, then showed little change. Seventy-two per cent of the crossbred cows calved for the first time at 2 years old compared with 65% of the Shorthorns. On the other hand, Shorthorn cows had the highest twinning percentage (2·9%) and the lowest single calf mortality at birth (1·4%). The maximum body weights of Angus, Charolais, and Hereford crossbreds and Shorthorn cows were 576·8, 655·8, 6254 and 553·8 kg respectively at 7–8 years of age.

Exposure to androgenised steers did not improve the fertility obtained in progesterone-based fixed-timed artificial insemination programs in extensively managed cows and heifers

2010 ◽  
Vol 50 (1) ◽  
pp. 68 ◽  
Author(s):  
R. Ungerfeld
Keyword(s):  
Artificial Insemination ◽  
Present Experiment ◽  
Minimum Distance ◽  
Transrectal Ultrasound ◽  
Reproductive Activity ◽  
Early Summer ◽  
The Other ◽  
Previous Exposure ◽  
Timed Artificial Insemination ◽  
Stimulation Of

Biostimulation – the stimulation of females’ reproductive activity by the presence of males – has been used to stimulate postpartum rebreeding in cows, and to advance puberty in heifers. The objective of the present experiment was to determine whether previous exposure to androgenised steers improves conception rates after a progesterone-based fixed-timed artificial insemination program applied during spring. Three trials were carried out between October and January (spring–early summer) with a total of 903 Hereford and Hereford × Angus cows and heifers. All of the females were isolated from male contact (minimum distance = 4000 m) 3 months before the beginning of the experiments. While one group (EXP) in each trial was exposed to androgenised steers for 20 days, the other group (ISO) remained isolated from males (bulls, steers) during the experiment. In trial 1, 248 and 267 heifers were included in the EXP and ISO groups, respectively; in trial 2, 141 and 134 spring calving cows were used for the same treatments; and in trial 3, 53 and 60 autumn-calving cows were respectively included in the experimental groups. All animals were joined and a traditional progesterone-based fixed-timed artificial insemination program was applied to all of them. Pregnancy was determined 45–50 days after insemination with transrectal ultrasound. There were no differences between the EXP and ISO groups in any of the trials. The general conception rate was 54.6, 50.2 and 54.0% in trials 1, 2 and 3, respectively. Overall, it was concluded that exposition to androgenised steers does not improve the fertility obtained in progesterone-based fixed-timed artificial insemination programs in extensively managed cows and heifers.

Seasonal variation in reproductive performance of Merino ewes in northern New South Wales

1962 ◽  
Vol 2 (4) ◽  
pp. 69 ◽  
Author(s):  
JF Barrett ◽  
TF Reardon ◽  
LJ Lambourne
Keyword(s):  
Seasonal Variation ◽  
Birth Weight ◽  
Reproductive Performance ◽  
New South ◽  
New South Wales ◽  
Early Summer ◽  
The Other ◽  
South Wales ◽  
Group A

Two groups of Merino ewes were observed for five years to determine the variation within years and to make comparisons between years in the numbers of ewes exhibiting oestrus, in fertility, and in lamb birth weights. A group of 35 ewes (continuous), was run constantly with vasectomized rams and services were recorded. From the other (changing) group, a fresh sub-group of 15 ewes was joined with fertile rams every four to six weeks; services were recorded, together with lambing performance and lamb birth weights.Distinct breeding and anoestrous seasons similar to those shown by other workers were observed in both groups of ewes. However, the onset of oestrous activity was a month earlier in the changing ewes than in the continuous ewes.Fertility was low during spring and early summer and reached a maximum in autumn.The birth weight of the lambs appeared to be predominantly influenced by the ewes' nutrition during pregnancy.

scholarly journals Effect of Body Condition Score, Treatment Period and Month of the Previous Lambing on the Reproductive Resumption of Melatonin-Treated Sarda Breed Sheep during Spring

Animals ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 1898
Author(s):  
Luisa Pulinas ◽  
Giovanni Cosso ◽  
Maria Consuelo Mura ◽  
Melissa Carvajal-Serna ◽  
Hatem Ouled Ahmed ◽  
...  
Keyword(s):  
Treatment Period ◽  
Body Condition ◽  
Body Condition Score ◽  
Reproductive Activity ◽  
Melatonin Treatment ◽  
The Third ◽  
Condition Score ◽  
Effect Of Treatment ◽  
Rearing Techniques ◽  
Breed Sheep

Stakeholders place great emphasis upon rationalizing the management and rearing techniques which are utilized within sheep farms. The present study aimed to investigate factors which may improve the reproductive performance of melatonin-treated Sardinian sheep via a series of three trials. The first trial (n = 100) investigated the effect of melatonin treatment alongside body condition score (BCS), the second trial (n = 150) investigated the effect of treatment alongside the date of treatment (treatment period) and the third trial (n = 150) investigated the effect of treatment alongside the previous lambing of the ewes. The findings indicated that melatonin is an effective tool for anticipating and improving the reproductive activity of in Sarda breed sheep during the springtime. Furthermore, to obtain optional results, melatonin implantation should be conducted in April, in ewes that have a BCS of >2.5 and that have passed their third month of lactation.

Reproductive Performance of Rabbit does Artificially Inseminated with Semen Supplemented with GnRH Analogue [des-Gly10, D-Ala6]-LH-RH Ethylamide

2016 ◽  
Vol 19 (3) ◽  
pp. 659-661
Author(s):  
P. Gogol
Keyword(s):  
Reproductive Performance ◽  
Ovulation Induction ◽  
The Other ◽  
Induction Treatment ◽  
Control Group ◽  
Synthetic Analogue ◽  
Gnrh Analogue ◽  
Intravaginal Administration ◽  
Group 5 ◽  
Lh Rh

Abstract The aim of the study was to evaluate, the ability of a GnRH synthetic analogue [des-Gly10, D-Ala6]-LH-RH ethylamide to induce ovulation in rabbit does using intravaginal administration. A total of 138 primiparous lactating does were randomly divided into 4 groups that at the time of insemination received following treatments for ovulation induction: 1 μg of buserelin administered intramuscularly (control group); 5 μg of [des-Gly10, D-Ala6]-LH-RH ethylamide added to the semen dose (D5 group); 10 μg of [des-Gly10, D-Ala6]-LH-RH ethylamide added to the semen dose (D10 group); 15 μg of [des-Gly10, D-Ala6]-LH-RH ethylamide added to the semen dose (D15 group). Kindling rates were 68.8% in D10 and 66.7% in D15 groups and were comparable to that obtained in the control group (72.2%). The kindling rate in group D5 (29.4%) was significantly lower than those recorded in the other groups. The number of live born kits was not significantly affected by the ovulation induction treatment. The results of this study show that [des-Gly10, D-Ala6]-LH-RH ethylamide added directly into the semen dose can effectively stimulate ovulation in rabbits. The dose of 10 μg of [des-Gly10, D-Ala6]-LH-RH ethylamide per doe was sufficient to produce results comparable to those obtained by intramuscular administration of buserelin.

WESTERN RHYACIONIA (LEPIDOPTERA: TORTRICIDAE, OLETHREUTINAE) PINE TIP MOTHS TRAPPED USING SYNTHETIC SEX ATTRACTANTS

1980 ◽  
Vol 112 (6) ◽  
pp. 591-603 ◽  
Author(s):  
Robert E. Stevens ◽  
Charles Sartwell ◽  
Thomas W. Koerber ◽  
Gary E. Daterman ◽  
Lonne L. Sower ◽  
...  
Keyword(s):  
New Mexico ◽  
South Dakota ◽  
New Records ◽  
Rocky Mountain ◽  
Early Summer ◽  
The Other ◽  
Western United States ◽  
Sex Attractants ◽  
Tip Moths ◽  
First Time

AbstractSynthetic sex attractants were used to trap Rhyacionia pine tip moths throughout the western United States in spring and early summer 1977 and 1978. Some species were shown to have much wider distributions than previously known. Among species responding to (E)-9-dodecenyl acetate, R. zozana was collected over most of the area, with new records for Washington, Idaho, Montana, Wyoming, and South Dakota; R. neomexicana was found for the first time in Utah, as was R. salmonicolor in New Mexico, Colorado, and Utah; R. monophylliana in Nevada and Utah; R. jenningsi in New Mexico; and R. multilineata in Arizona and Oregon. Among species caught in traps baited with (E,E)-8,10 dodecadienyl acetate, R. busckana was found widely through the Northwest, for the first time in Montana and Wyoming, and R. fumosana was captured throughout the Rocky Mountain states, with new records for Montana, Utah, and Nevada. Sets of two previously unknown zozana -like moths were collected. One is closely associated with the typical form in Oregon and California; the other is a pinyon associate in Colorado and New Mexico.

scholarly journals EFFECT OF KISPEPTIN-10 AS AN ALTERNATIVE TO ECG IN ESTRUS SYNCHRONIZATION PROTOCOL ON IMPROVING THE REPRODUCTIVE PERFORMANCE OF KARADI EWES

2021 ◽  
Vol 52 (3) ◽  
pp. 535-546
Author(s):  
T. A. Abdulkareem ◽  
S. J. Muhammad ◽  
A. N. Yousif
Keyword(s):  
Body Weight ◽  
Chorionic Gonadotropin ◽  
Reproductive Performance ◽  
The Other ◽  
Control Group ◽  
Estrus Synchronization ◽  
Serum Progesterone ◽  
Live Body Weight ◽  
Equine Chorionic Gonadotropin ◽  
Synchronization Protocol

This study was conducted to examine the effect of Kisspeptin-10 as an alternative to equine chorionic gonadotropin (eCG) in estrus- synchronization protocol for improving the reproductive performance of Karadi ewes. Forty adult ewes of 3-7 years old and 65–70 kg live body weight were equally divided into four equal groups. Animals were inserted with a progestagen (60 mg MAP)-impregnated sponges for 13 days as estrus synchronization protocol. Following withdrawal of sponges, first group was served as control (C) and intramuscularly injected with normal saline only. The second group was intramuscularly injected with 250 IU of eCG (eCG), while those of third and fourth groups were intravenously injected with 4 and 8 µg /kg body weight of Kisspeptin-10, referred as Kisspeptin1 and Kisspeptin2 groups respectively. Serum progesterone and LH concentrations did not significantly differ among groups before estrus synchronization protocol and eCG or Kisspeptin treatments. The two Kisspeptin-injected groups attained better (P≤0.01) overall mean estrus (100%), fertility (90%), conception (90 and 100%, respectively), lambing (90%), and twinning (10%) rates with lesser barrenness (10%) as compared with the other groups. Moreover, eCG and Kisspeptin groups exhibited greater (P≤ 0.01) percentage of increasing fecundity (233%) and extra lambs born (0.7) than the control group. In conclusion, treatment of Karadi ewes either with Kisspeptin-10 or eCG hormones enhanced the overall reproductive performance, but did not affect serum progesterone and LH concentrations.

Sign in / Sign up

Export Citation Format

Share Document