Male reproductive disorders, Biology

MALE REPRODUCTIVE DISORDERS


Generally, about 5-10% of cattle bulls reaching sexual maturity would be suffering from poor reproductive efficiency or sterility. Crossbreeding has brought in its wake an additional problem related to male infertility. Domesticated cattle, classified into two major groups, zebu (Bos indicus) and European (Bos taurus) are believed to descend from the same wild species, the Aurox (Bos primigenius). Most of the cattle indigenous to the tropics belong to the zebu species. The potential for milk production is poorly developed in most zebu cattle. As various countries tackle the challenge of increasing the productivity of their dairy cow populations, the substantial genetic difference in milk production potential between Bos indicus breeds and Bos taurus breeds is too large to go unnoticed. Hence, application of artificial insemination has made crossbreeding between Bos taurus and Bos indicus populations widely possible for substantial increase in milk yield. However, the male crossbred offsprings are often inferior to purebreds in semen production. The proportion of males reserved for breeding and reaching successful semen freezing stage was lowest (29%) in Karan Fries (cross between Sahiwal or Tharparkar with Holstein Freisian cattle) and highest (45%) in Sahiwal cattle and poor semen quality was an important reason of disposal in Karan Fries bulls. Poor semen quality has been found to be the main reason of disposal in adult breeding Karan Fries bulls above 3 years of age. The relative importance of the bull in achieving high standards of fertility is tremendous to the extent that it is often said that the bull is half the herd.


Sub-fertility and sterility in bulls could emanate from genetic congenital abnormalities or developed during its lifetime.

Posted Date: 9/17/2012 4:13:51 AM | Location : United States







Related Discussions:- Male reproductive disorders, Assignment Help, Ask Question on Male reproductive disorders, Get Answer, Expert's Help, Male reproductive disorders Discussions

Write discussion on Male reproductive disorders
Your posts are moderated
Related Questions
Consequences of Aging It is hard to enumerate the general consequences of aging in different animals. Gradual loss of reproductive ability, neuromuscular coordination and not

Explain Historical Example of connecting models and data? An excellent instance of a program that links theory and data is collaborative work on the population dynamics of flou

What is mitosis

Excluding the effects of cardiac output and hormones, describe the other factors that may affect blood pressure and blood flow in a middle-aged man who is exercising in an aerobics

brief account on classification and general characters of protozoa

describe the function of a bacterial flagellum

Molecular Biology Transgenesis: pro-nuclear injection of isolated gene into fertilised egg cell, cell divides to form embryo, then embryo implanted into surrogate.

Define Sample Titration for Saponification Number of Fats? Measure 2 ml of oil with the help of a pipette and transfer this oil to a 250 ml conical flask. Add 40 ml of alcoholi

Explain about the Nutritional Requirements? Nutritional requirements are defined as 'intake levels of nutrients that meet specified criteria of adequacy such as normal growth,

Q. How to Investigate mitral stenosis by Electrocardiogram? Electrocardiographic changes are not specific for mitral stenosis and are never diagnostic for any valvular heart di