Breeding and management strategies to improve reproductive efficiency in dairy cattle

2017 ◽  
pp. 243-282
Author(s):  
D. J. Ambrose ◽  
◽  
J. P. Kastelic ◽  
◽  
Keyword(s):  
Dairy Cattle ◽  
Management Strategies ◽  
Reproductive Efficiency

The association between antibody titres againstCampylobacter fetus and reproductive efficiency in dairy cattle

1993 ◽  
Vol 17 (2) ◽  
pp. 95-107 ◽  
Author(s):  
S. Akhtar ◽  
H. P. Riemann ◽  
M. C. Thurmond ◽  
C. E. Franti
Keyword(s):  
Dairy Cattle ◽  
Reproductive Efficiency ◽  
Antibody Titres

scholarly journals Non-specific Bacterial Profiles in Reproductive Tract of Dairy Cattle during Artificial Insemination

2021 ◽  
Vol 11 (1) ◽  
pp. 110-114
Author(s):  
Astin Islam Andriani ◽  
Sri Pantja Madyawati ◽  
Emy Koestanti Sabdoningrum
Keyword(s):  
Dairy Cattle ◽  
Bacterial Infection ◽  
Artificial Insemination ◽  
Reproductive Tract ◽  
The Other ◽  
Reproductive Efficiency ◽  
Reproductive Disorders ◽  
Bacterial Isolation ◽  
Isolation And Identification ◽  
Other Hand

One of the causes of low reproductive efficiency in dairy cattle is the presence of reproductive disorders caused by a non-specific bacterial infection. The aim of the present study was to isolate and identify the genus of non-specific bacteria in the reproductive tract of dairy cattle during artificial insemination. A total of 10 samples in the form of mucus attached to the plastic sheath used after artificial insemination in dairy cattle were collected in the study. The samples were subjected to bacterial isolation and identification. The obtained results of the study indicated that Staphylococcus was the dominant genus found (90%). On the other hand, other genera were Escherichia (60%) and Corynebacterium (20%).

scholarly journals Suckling, male effect and kisspeptin in the reproductive management of ewes in postpartum anestrus

2021 ◽  
Author(s):  
José M. Hernández-Hernández ◽  
Jaime Gallegos-Sánchez ◽  
Carlos M. Becerril-Pérez ◽  
Arturo Pro-Martínez ◽  
Ponciano Pérez-Hernández
Keyword(s):  
Reproductive Behavior ◽  
Design Methodology ◽  
Management Strategies ◽  
Local Environment ◽  
Reproductive Efficiency ◽  
Endogenous Opioid Peptides ◽  
Endogenous Opioid ◽  
Scientific Publications ◽  
Reproductive Management ◽  
Male Effect

Objective: To describe the management strategies of controlled suckling and the male effect to reduce postpartum anestrus, and to show the participation of kisspeptin to regulate the effect of both factors. Design/Methodology/Approach: A review of scientific publications was conducted, in order to show the importance of suckling and the male effect as strategies to reduce postpartum anestrus in the ewe, as well as the relation of kisspeptin with both factors. Results: Seasonal anestrus can be avoided with the use of breeds adapted to the local environment, such as Pelibuey. Postpartum anestrus occurs mainly as a result of suckling, since the latter inhibits the pulsating secretion of the gonadotropin-releasing hormone (GnRH) and the luteinizing hormone (LH). The exact path of this inhibition is unknown, although it seems that endogenous opioid peptides and kisspeptin are intermediaries. Controlled suckling and the male effect are management strategies that improve the reproductive behavior of postpartum ewes. Kisspeptin regulates the influence of the male effect through the secretion of GnRH/LH. Study Limitations/Implications: To understand the impacts of suckling and the male effect on the duration of postpartum anestrus, as well as the participation of kisspeptin in the regulation of both effects, will allow designing management strategies to improve the reproductive efficiency of the ewes. Findings/Conclusions: Controlled suckling and the male effect reduce postpartum anestrus and improve the reproductive behavior of the ewes; advancing knowledge of the kisspeptin effect could improve the effectiveness of both techniques.

Effect of first 60-day cumulative milk yield on days open in Holstein dairy cows in Iran

2007 ◽  
Vol 2007 ◽  
pp. 148-148
Author(s):  
A. Heravi Moussavi ◽  
M. Danesh Mesgaran ◽  
T. Vafa
Keyword(s):  
Dairy Cattle ◽  
Dairy Cows ◽  
Milk Production ◽  
Milk Yield ◽  
Dairy Farm ◽  
Reproductive Efficiency ◽  
Root Cause ◽  
Principal Factors ◽  
Days Open ◽  
Holstein Dairy Cows

Reproduction and milk production are the principal factors that are influencing dairy farm profitability. The dairy industry in Iran has changed dramatically in the last decade. The shift toward more productive cows and larger herds in Iran is associated with a decrease reproductive efficiency (Heravi Moussavi et al., 2004). Increased knowledge about the principal causes of reduced fertility is essential. The root cause of the declining fertility is probably a combination of a variety of physiological and management factors that have an additive effect on reproductive efficiency. Dairy cattle are inseminated and pregnancy is established while dairy cows are lactating. Based on the analyses of large datasets, there is clearly an antagonistic relationship between milk production and reproduction in dairy cattle (Lucy, 2001). It was shown that the hazard ratio for cumulative first 60-day milk yield and conception in high producer cows was 8 percent less than the others and also high milk yield was a risk factor for several reproductive disorders (Grohn and Rajala-Schultz, 2000). The objective of this study was to evaluate the effect of first 60-day cumulative milk yield on days open in Iranian Holstein dairy cows.

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