Agricultural Research Management Information System

Home
Research Summary
Search
About Us
- ARMIS
- Brochure
Contact Us
Report
User Request
Data Input
Help
- Operation Manual
  - PDF
  - Video
- Program Area & Commodity
We have reached 37600 number of research entries at this moment.

- Logout

Research Detail

Home
Research
Detail

Biometrical Studies of Reproductive Organs of Dairy Cows of Different Genotypes in Bangladesh

R. Khaton
Department of Animal Husbandry and Veterinary Science, University of Rajshahi, Rajshahi - 6205, Bangladesh.

M. J. U. Sarder
Department of Animal Husbandry and Veterinary Science, University of Rajshahi, Rajshahi - 6205, Bangladesh.

M. R. Gofur
Department of Animal Husbandry and Veterinary Science, University of Rajshahi, Rajshahi - 6205, Bangladesh.

Abstract/ Executive Summary:

Genotype has a significant effect on biological efficiencies of dairy cows. Environmental changes affect differently between different genotypes of animals. A biometrical study was conducted on reproductive organs of dairy cows (n = 100) of different genotypes (Local, Local×Holstein Friesian, Local×Jersey and Local×Sahiwal) available in Bangladesh. Reproductive tracts of cows were collected immediately after slaughter from different slaughter houses in Rajshahi, Bangladesh. The comparison of morphometric values of most of the parameters of reproductive tract observed in different genotypic cows showed significant differences (p<0.05). Local×Holstein Friesian had significantly higher values (p<0.05) on the most of parameters of genitalia measured, followed by the Local×Jersey, Local×Sahiwal and Local. Local×Holstein Friesian had the longest uterine horn (29.20±1.65 cm for right and 29.87±1.75 cm for left), uterine body (3.42±0.20 cm length and 2.83±1.40 cm width), cervix (5.64±0.24 cm length and 4.89±0.23 cm width) and vagina (24.66±0.64 cm length and 6.08±0.36 cm width). The right ovary was wider in diameter, larger in length and heavier in weight as compared to left one in all genotypes. This confirms the fact of right ovary being more active than the left one. Moreover, the biometry of ovary and tubular parts of genitalia in Local×Holstein Friesian and Local×Jersey cows are suggestive for selection of crossbred dairy cows to get maximum benefits from crossbreeding in respect of productive and reproductive performance and also for genetic improvement.

Keywords: Biometry, Dairy Cows, Genotype, Reproductive Organs

Location: Rajshahi, Bangladesh.

Start Date: 00-09-2014

End Date: 00-03-2015

Program Area: Variety and Species

Commodity: Cow

Objectives:

To determine and compare the reproductive tracts’ morphometry of different genotypes of cow as well as to establish baseline data on the normal dimensions of different segments of the reproductive tract of cows in Bangladesh

Methodology:

The present study was conducted on 100 non-gravid female reproductive organs of different genotypes (Local, n = 43; Local×Holstein Friesian, n = 24; Local×Jersey, n = 20 and Local×Sahiwal, n = 13) of cows, at different slaughter-houses in Rajshahi, Bangladesh. Reproductive tracts were randomly collected during the routine slaughtering operations and brought to the laboratory for biometrical studies during the period from September 2014 to March 2015. Reproductive organs included ovaries (length, width, thickness and weight), oviducts (length), uterine horns (length), body of uterus (length and width), cervix (length, width and ring), vagina (length and width) and vulva (length and width). Cervical rings and folds were considered as the number of rings/folds from os externum to os internum. After collection, reproductive organs were transferred to the laboratory in physiological saline solution within 30 min of slaughter. As documented the ovaries were removed at their junction with the ovarian ligament as close to the ovarian tissue as possible after the fimbria was removed. The length of ovary was taken along the excision from the ovarian ligament with the help of electronic digital calliper (Stainless Hardened). The width was taken as the greatest line perpendicular to the length line. The weight of ovary was taken with the help of electrical weighing balance. The oviducts were dissected out and a measurement taken on their extended length from the top of the fimbria to the tubal-uterine horn junction. The uterine horns were dissected free of their ligamentous attachments and extended their full length for measurement. Each uterine horn was incised along its dorsal surface to expose its lumen from the oviduct tubal junction to the bifurcation of the body of the uterus. The body of the uterus was also incised and this dorsal incision continued in a straight line to the dorsal commissure of the vulva in order to fully expose the cervical canal and the vagina. This method of exposure gave the relative thickness of the walls of the uterine horns, body of the uterus, cervix and vagina. The length of the uterine body was taken from its bifurcation to the internal os of the cervix. The length and diameter of the cervix was recorded. The length of the vagina was taken as the distance from the external os of the cervix to the ventral commissure of the vulva. A measurement of the vaginal width was regularly taken at a point from the external os of the cervix, prior to extending the dorsal incision through the vagina. All measurements were taken with a thin, flexible and graduated steel tape. Measurement errors due to variation in operator technique were kept to a minimum by following a standard procedure of dissection with each tract in an identical position. All measurements were recorded in centimeters with the help of electronic digital calliper, China (Stainless hardened) and measuring tape. All weights were recorded in grams by using electrical weighing balance. Data was presented as Mean±SE. The DMRT was performed to observe significant differences of parameters of reproductive organs between different genotypes of cows. All analysis was performed using SPSS software version 20. p<0.05 was considered as significant.

Source of Information: Asian Journal of Animal Sciences, Year: 2015, Volume: 9, Issue: 6, Page No.: 388-395, ISSN 1819-1818

Article Link (Online Journal): DOI: 10.3923/ajas.2015.388.395, URL: http://scialert.net/abstract/?doi=ajas.2015.388.395

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

From the present study it is concluded that the biometrical study based on available genotype is essential for getting better performance. Moreover, the biometry of reproductive organs in Local×Holstein Friesian and Local×Jersey cows is imperative for selection of dairy cows to get the better productive and reproductive performance from crossbreeding and also for genetic improvement in respect of Bangladesh. The data of present study also provide a baseline information about biometry of various parts of the reproductive organs of cows of available genotypes in Bangladesh that will certainly help in teaching and further research on the anatomy and physiology of the reproductive system of dairy cows. As, selection of dairy animals for economic traits like reproductive performance, productive life, health and survival greatly depends on genotypic traits, the present study certainly help in selecting better quality crossbred dairy cows for livestock and genetic improvement.

Knowledge Management: Journal