Oestrous cycle synchronization in Zebu cattle and its use in cattle production and management in the tropics

1973 ◽  
Vol 80 (2) ◽  
pp. 329-340 ◽  
Author(s):  
W. Jöchle ◽  
M. A. Hidalgo ◽  
T. Giménez ◽  
R. Garcia C.
Keyword(s):  
Artificial Insemination ◽  
Diagnostic Value ◽  
Oestrous Cycle ◽  
Estradiol Valerate ◽  
Zebu Cattle ◽  
Cattle Production ◽  
Reproductive Life ◽  
The Tropics ◽  
European Cattle ◽  
Zebu Cows

SummaryBetween March and August 1968 to 1970, Chlormadinone acetate (CAP), 10 mg/head/ day, was administered to 668 Zebu cows and heifers for oestrous cycle synchronization for 14, 12, or 9 days, the latter schedule supported by an injection of 5 mg estradiol valerate on day 2 to achieve luteolysis. Applied orally over a period of 14 days, CAP provided a reliable method for cycle synchronization. The severe anoestrous rate experienced in all herds reduced the overall percentage of synchronized animals. Fertility from insemination during the first synchronization period (day 2 to 10 after treatment) was slightly, yet insignificantly reduced, but was completely restored during the second synchronization period (day 20–30). Insemination only during this second synchronization period resulted in conception and pregnancy rates similar to those combined from the first and second synchronization period.Of factors tested for influencing synchronization and fertility, presence or absence of penis-deviated teaser bulls (psycho-stimulation) had no effect on the percentage of animals synchronized, or on post-treatment fertility. In well-managed herds, the percentage of animals responding to treatment was predetermined by the number of animals already cycling, reflecting their phase of reproductive life. Levels of management had an important impact on the success of cycle synchronization combined with artificial insemination. Both methods are managerial tools for improvement of already good management. Their failure under insufficient management conditions has diagnostic value.Possibilities and limits shown for oestrous cycle synchronization in Zebu cattle were similar to those reported in European cattle. Within these limits, CAP can be employed successfully as a means for cycle synchronization, providing sufficient synchronization and acceptable fertility and allowing economical use of artificial insemination.

Oestrous cycle synchronization and oestrus induction in indigenous and European cattle in Tanzania

1973 ◽  
Vol 81 (3) ◽  
pp. 381-389 ◽  
Author(s):  
H. Schmidt ◽  
W. Jöchle ◽  
D. Smidt
Keyword(s):  
Bos Taurus ◽  
Oral Treatment ◽  
Treatment Success ◽  
Bos Indicus ◽  
Oestrous Cycle ◽  
Estradiol Valerate ◽  
Wide Range ◽  
Reproductive Life ◽  
The Tropics ◽  
European Cattle

SUMMARYFrom 1969 to 1971, 743 animals (indigenous Zebu and European dairy cattle, lactating or dry cows and heifers) received oestrous cycle synchronization treatments at government-owned and private ranches and farms in the Tanzanian highlands (West Kilimanjaro); 445 matching animals served as controls. Treatment schedules consisted of chlormadinone acetate (CAP) given daily for 14 days (10 mg/day) orally; or a single CAP injection (50 mg) followed by 4 or 5 days of oral treatment (10 mg/day) 9–12 or 11–15 days later. In addition, some groups received either estradiol valerate (5 mg) together with the CAP injection, or 10 mg/day mestranol from day 11 to 15, together with CAP; one treatment group received 1000 i.u. of HCG after the last CAP medication and were inseminated 12 and 24 h thereafter. Animals were either inseminated or bred naturally. With all treatment schedules, good synchronization, unimpaired fertility and consistently a significant reduction of anoestrus was achieved. Oestrogen treatments had no effects; treatment with 1000 i.u. of HCG was unsuccessful. Management factors, food supply and phase of reproductive life had significant impacts on treatment success and fertility. Synchronization can be used successfully under a wide range of management conditions to unfold existing potentials of artificial insemination in Bos indicus and Bos taurus in the tropics.

Some observations on reproduction, weight change under lactation stress and the mothering ability of British and crossbred-Zebu cattle in the tropics

1965 ◽  
Vol 64 (3) ◽  
pp. 407-412 ◽  
Author(s):  
G. H. Lampkin ◽  
J. F. Kennedy
Keyword(s):  
Weight Change ◽  
Stress Conditions ◽  
Zebu Cattle ◽  
The Tropics ◽  
Zebu Cows

Data on the performance of British, Africander cross British and Brahman cross British females were examined. Of the animals mated only 56-0% of the homebred British cows produced live calves compared with 77-3 and 73-8% from Africander and Brahman cross cows respectively. Evidence was found that the low calving percentage for the.British females was connected with breeding stress, the British females being frequently unable to maintain weight if pregnancies occurred in two successive years. Under similar stress conditions crossbred-Zebu cows could thrive and breed and crossbred Brahmans in particular would normally maintain their weight.

scholarly journals Reproductive Performance Following Transcervical Insemination with Frozen Thawed Semen in Ewes Submitted to Surgical Incision of Cervical Folds (SICF): Comparison with Laparoscopic Artificial Insemination

Animals ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 108
Author(s):  
Salvatore Pau ◽  
Laura Falchi ◽  
Mauro Ledda ◽  
Ivo Pivato ◽  
Melosu Valentino ◽  
...  
Keyword(s):  
Reproductive Performance ◽  
Artificial Insemination ◽  
Laparoscopic Group ◽  
Oestrous Cycle ◽  
Surgical Incision

Transcervical artificial insemination (AI) after the surgical incision of cervical folds (SICF) could represent a valid alternative to laparoscopic AI when frozen thawed semen is used. The aim of this experiment was to compare pregnancy (PR) and lambing rates (LR) of ewes submitted either to transcervical AI after SICF or to laparoscopic AI using frozen thawed semen. Pregnant at term ewes (n = 80) were allocated in two experimental groups. After lambing, one group (n = 39) was submitted to SICF. The remaining ewes that were regularly lambed were allocated to the group of laparoscopic AI (n = 40). Six months later, oestrous cycle of both experimental groups was synchronised and all ewes were artificially inseminated with frozen thawed semen. Ewes submitted to SICF underwent transcervical insemination and intrauterine deposition of semen was recorded. The remaining animals were submitted to laparoscopic AI. Pregnancy and LR were recorded. Intrauterine deposition of semen was possible in 89.7% pf ewes submitted to SICF. This group showed similar PR and LR compared to the laparoscopic group (respectively: PR, 71.8% vs. 70% and LR, 64.1% vs. 65%; p > 0.05). Transcervical AI after SICF may represent a valid alternative to laparoscopy in AI protocols requiring the use of frozen thawed semen.

Progeny Testing of Dairy Bulls at Different Levels of Management

1954 ◽  
Vol 1954 ◽  
pp. 83-85 ◽  
Author(s):  
I. L. Mason
Keyword(s):  
Dairy Cattle ◽  
Experimental Evidence ◽  
Environmental Conditions ◽  
The Other ◽  
Progeny Testing ◽  
Laboratory Mice ◽  
Dairy Bulls ◽  
The Tropics ◽  
Different Levels ◽  
European Cattle

There are two schools of thought concerning the most appropriate environment in which to select breeding animals. One says ‘ Always select animals under environmental conditions similar to those where they are to be used ‘. The other says ‘ Select breeding animals in the optimum environment so that they have the best chance of revealing their genetic capabilities ‘. Experiments on growth of laboratory mice and experience with European cattle in the tropics have shown the advisability of the first course in these cases. In regard to hill sheep and dairy cattle in Britain, on the other hand, practice favours the second course, but there is little experimental evidence to support it.

Fertility in Zebu Cattle (Bos indicus) After Prostaglandin Administration and Artificial Insemination

1999 ◽  
Vol 158 (1) ◽  
pp. 53-58 ◽  
Author(s):  
P.I. REKWOT ◽  
E.O. OYEDIPE ◽  
E. MUKASA-MUGERWA ◽  
V.O. SEKONI ◽  
O.P. AKINPELUMI ◽  
...  
Keyword(s):  
Artificial Insemination ◽  
Bos Indicus ◽  
Zebu Cattle

Effect of type of intravaginal progestagen on the outcome of fixed-time artificial insemination

1981 ◽  
Vol 96 (1) ◽  
pp. 243-245 ◽  
Author(s):  
P. A. Smith ◽  
M. P. Boland ◽  
I. Gordon
Keyword(s):  
Artificial Insemination ◽  
Present Experiment ◽  
Fixed Time ◽  
Field Trials ◽  
Oestrous Cycle ◽  
Conception Rates ◽  
Natural Service ◽  
Dose Levels ◽  
Pregnant Mare Serum Gonadotrophin

It is now possible to synchronize the cycle of ewes at all times of the year (Gordon, 1975). Conception rates approaching those obtained following natural service have been reported following double (Colas & Brice, 1970; Colas et al. 1973; Barlow, Pryce-Jones & Reed, 1974; Gordon, 1975) or single (Smith, Boland & Gordon, 1978) set-time inseminations. In France, synchronization of ewes' oestrous cycle is based on the use of a Cronolone pessary (Colas, 1975), while field trials conducted in Britain have used the 60 mg Medroxy progesterone acetate (MAP) sponge (Barlow et al. 1974). Robinson et al. (1967) in an evaluation of different progestagen treatments found MAP to be less predictable than Cronolone. The purpose of the present experiment therefore was to evaluate the use of a 30 mg Cronolone or a 60 mg MAP intravaginal treatment when used in conjunction with fixed-time inseminations. In addition, two dose levels of pregnant mare serum gonadotrophin (PMSG) were compared.

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