Reproductive performance of cows after fixed-time artificial insemination with ovulation synchronisation and re-synchrony in southern Australian dairy herds

2018 ◽  
Vol 96 (4) ◽  
pp. 111-119 ◽  
Author(s):  
MM Izzo ◽  
M Humphris ◽  
L Pryor ◽  
A Perry ◽  
JM Morton
Keyword(s):  
Reproductive Performance ◽  
Artificial Insemination ◽  
Fixed Time ◽  
Dairy Herds

scholarly journals Effects on Synchronization and Reproductive Efficiency of Delaying the Removal of the Intravaginal Progesterone Device by 24 h in the 5d Co-synch Protocol in Heifers

Animals ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 849
Author(s):  
Aitor Fernandez-Novo ◽  
Sergio Santos-Lopez ◽  
Jose Luis Pesantez-Pacheco ◽  
Natividad Pérez-Villalobos ◽  
Ana Heras-Molina ◽  
...  
Keyword(s):  
Animal Welfare ◽  
Reproductive Performance ◽  
Artificial Insemination ◽  
Fixed Time ◽  
Reproductive Efficiency ◽  
Beef Heifers ◽  
Animal Management ◽  
Commercial Farms ◽  
Beef Herds ◽  
Farm Economics

In beef herds, increasing animal welfare, improving reproductive performance and easing animal management are key goals in farm economics. We explored whether delaying the removal of the intravaginal progesterone device by 24 h in heifers synchronized with a 5d Co-synch 72-h protocol could improve reproductive efficiency of fixed-time artificial insemination (FTAI). In experiment 1, we examined the total synchronization rate (TSR) in cycling Holstein heifers. Heifers (13.4 ± 0.69 mo.) were randomly assigned to the standard 5d Co-synch 56-h protocol (5dCo56; n = 10), 5d Co-synch 72-h (5dCo72; n = 17), or the modified 5d Co-synch 72-h protocol, in which removal of the progesterone device was delayed by 24 h (6dCo48; n = 19). In experiment 2, 309 cycling beef heifers on 18 commercial farms were subjected to the 5d Co-synch 72-h or 6-d Co-synch 48-h protocol and conception rate (CR) studied. In experiment 1, the three protocols led no differences on TSRs of 80.0% (5dCo56), 88.2% (5dCo72), and 89.5% (6dCo48). In experiment 2, the CR from the beef heifers, observed during two consecutive reproductive seasons did not differ: 59.7% for 5dCo72 and 62.0% for 6dCo48 (p = 0.907). Therefore, delaying removal by 24 h provides satisfactory results without reducing reproductive efficiency of heifers.

Factors affecting reproductive performance of white-tailed deer subjected to fixed-time artificial insemination or natural mating

2013 ◽  
Vol 25 (3) ◽  
pp. 581 ◽  
Author(s):  
Miguel Mellado ◽  
Claudia G. Orta ◽  
Eloy A. Lozano ◽  
Jose E. García ◽  
Francisco G. Veliz ◽  
...  
Keyword(s):  
Litter Size ◽  
Reproductive Performance ◽  
Artificial Insemination ◽  
Fixed Time ◽  
Arid Environment ◽  
Factors Affecting ◽  
Litter Weight ◽  
Subsequent Period ◽  
Natural Mating ◽  
Game Hunting

The objectives of this study were to examine the effects of several factors affecting fawning rate, litter size, litter weight and neonatal fawn mortality in white-tailed deer inseminated either transcervically or by means of laparoscopy. Oestrus synchronisation with a controlled internal drug release (CIDR)-based protocol and fixed-time artificial insemination (FTAI) was conducted in 130 white-tailed deer (Odocoileus virginianus texanus) during three reproductive seasons (2007–2009; 271 services) in a game-hunting ranch in a hot–arid environment (26°4′ N, 101°25′ W). Ninety additional non-treated does were exposed to bucks for natural mating. Fawning rate did not differ between AI methods (40.0 vs 45.0% for transcervical and laparoscopic AI, respectively). Overall fawning rate (proportion of all does fawning after FTAI and a subsequent period of buck exposure) did not differ between transcervical (89.5%), laparoscopic (80.3%) or natural (88.9%) insemination. Litter size per fawning doe was higher (P<0.05) in naturally-served does (1.65±0.48) than in transcervically-inseminated does (1.40±0.51) or in laparoscopically-inseminated does (1.48±0.50). The main conclusion was that no enhancement of fawning rate or litter size occurred as a result of intrauterine deposition of semen by laparoscopy compared with the transcervical insemination technique.

A SURVEY OF DAIRY HERDS IN THE FRASER VALLEY OF BRITISH COLUMBIA TO DETERMINE POSSIBLE CAUSES OF UNSATISFACTORY REPRODUCTIVE PERFORMANCE

1977 ◽  
Vol 57 (3) ◽  
pp. 395-404 ◽  
Author(s):  
R. G. PETERSON ◽  
D. E. WALDERN
Keyword(s):  
British Columbia ◽  
Reproductive Performance ◽  
Artificial Insemination ◽  
Soil Samples ◽  
Dairy Herds ◽  
Return Rates ◽  
Factors Associated ◽  
Preliminary Study ◽  
Fraser Valley ◽  
Feed Samples

In a preliminary study of reproductive performance of 261 dairy herds in the Lower Fraser Valley of British Columbia for the period 1966 through 1970, mean non-return rate was 4.7% less in 1970 than in the previous 4 yr. In February 1972, factors associated with the reproductive performance of 68 herds in the same region were studied in greater detail. Herd non-return rates for 1971 were estimated from artificial insemination (AI) unit records. Feed samples, soil samples, feed intakes, and herd production levels were obtained for each period. The results indicated that differences in mineral nutrition between herds were associated with reproductive performance. The Cu/Mo ratio in silage was the most important factor, with increases in Cu relative to Mo being associated with low herd non-return rates. Other minerals found to be important included the Cu/Mo ratio in hay and grain, Cu in hay, Mo and Se in grain, Ca and P in silage and the variability of soil Mg levels. The type of forage fed was also important, with herds receiving diverse rations having higher conception rates than those restricted to one type of silage and/or hay.

scholarly journals Reproductive performance of fixed-time artificial insemination in swine and factors for the technology success

2019 ◽  
Vol 49 (2) ◽  
Author(s):  
Monike Quirino ◽  
Ana Raquel Almeida Pinheiro ◽  
Joabel Tonellotto dos Santos ◽  
Rafael da Rosa Ulguim ◽  
Ana Paula Gonçalves Mellagi ◽  
...  
Keyword(s):  
Reproductive Performance ◽  
Artificial Insemination ◽  
Fixed Time ◽  
Slight Reduction ◽  
Estrus Synchronization ◽  
Swine Production ◽  
Fertility Index ◽  
Labor Requirement ◽  
Estrus Detection ◽  
Farrowing Rate

ABSTRACT: Fixed-time artificial insemination (FTAI) is a reproductive technology that aids in obtaining an appropriate time to perform single artificial insemination (AI), thus reducing the number of inseminations per sow bred. FTAI protocols can either be based on estrus detection or day of weaning, aiming to synchronize ovulation using ovulation inducers. The protocols involving estrus detection usually employ porcine luteinizing hormone (pLH) as an inducer and, in general, satisfactory reproductive performance is observed. For protocols based on weaning day, the main hormone used is analog of gonadotropin-releasing hormone such as triptorelin and buserelin. Regardless of the protocol, the number of piglets born is usually not affected by FTAI. However, a possible compromise in the farrowing rate should be considered. The FTAI in gilts requires progestogen treatment for estrus synchronization, increasing the labor requirement and cost of protocol. Some of the benefits of FTAI are a reduced number of semen doses required, advantage of planning the breeding time and; consequently, optimizing labor involved. However, the limitations include a slight reduction in the fertility index due to the compromised farrowing rate in some cases, costs incurred by following the protocol, and difficulty in measuring all the conceptual benefits under commercial conditions. The aim of this review is to approach the reproductive performance of the current protocols of FTAI, considering the benefits and limitations of this technology in swine production.

Reproductive performance of weaned sows after single fixed-time artificial insemination under a tropical climate: Influences of season and insemination technique

2020 ◽  
Vol 142 ◽  
pp. 54-61 ◽  
Author(s):  
Pachara Pearodwong ◽  
Chanyuth Tretipskul ◽  
Raphee Panyathong ◽  
Kridtasak Sang-Gassanee ◽  
Miquel Collell ◽  
...  
Keyword(s):  
Reproductive Performance ◽  
Artificial Insemination ◽  
Fixed Time ◽  
Tropical Climate ◽  
Climate Influences

scholarly journals Effects of fixed-time artificial insemination using triptorelin on the reproductive performance of pigs: a meta-analysis

animal ◽  
2020 ◽  
Vol 14 (7) ◽  
pp. 1481-1492 ◽  
Author(s):  
Z. Wang ◽  
B.S. Liu ◽  
X.Y. Wang ◽  
J.L. Peng ◽  
X.Q. Huang ◽  
...  
Keyword(s):  
Reproductive Performance ◽  
Artificial Insemination ◽  
Meta Analysis ◽  
Fixed Time

Technologies for fixed-time artificial insemination and their influence on reproductive performance of Bos indicus cattle

2007 ◽  
Vol 6 (1) ◽  
pp. 223-236 ◽  
Author(s):  
GA Bó ◽  
L Cutaia ◽  
LC Peres ◽  
D Pincinato ◽  
D Maraña ◽  
...  
Keyword(s):  
Reproductive Performance ◽  
Artificial Insemination ◽  
Bos Indicus ◽  
Fixed Time
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