In general, genetic selection is applied after first calving to traits that manifest themselves during the animal's productive life, mostly during the early part of productive life. This selection policy has had undesirable correlated responses in other economically important traits, such as health and fertility, and may also have had an effect on the growth of animals both during productive li...

In this paper, the potentials and constraints on estrus synchronization (ES) artificial insemination (AI) practice for dairy cattle producers were overviewed. Compared to other African countries, Ethiopia has large numbers of population. However, self-sufficiency in milk production is not yet attained due presence a lot limitations that hamper success ES mass AI many parts country such as impro...

Abstract Regrouping dairy cows is a common feature of farm management. Cows are grouped based on lactation stage, age, milk yield and other factors. during the dry period (from far-off area to close up from main herd) brings new challenges. This especially true for heifers who, after being confirmed gravid, may be into pen with dried off cows. The aims this study were determine how grouping aff...

A study was done to evaluate the effect of using progesterone (P4) intravaginal device (CIDR: controlled internal drug-releasing dispenser) to synchronise the return to oestrus of previously timed inseminated (TAI) dairy heifers, and to evaluate embryo survival and pregnancy rate (PR) in the return to oestrus heifers. At the onset of the artificial insemination (AI) breeding period (day -9), he...

This report is on infestation with Chorioptes bovis of Holstein cattle on a dairy farm included 900 cowsin Tabriz. Ten heifers and 25 milking cows under the age of 5 years were infested. Clinical signs consisted ofalopecia, crusts, ulcerations and superficial skin fissures. Pruritus and itching were severe in all cases.Lesions were present around the base of the tail, on the neck and below the ...

Between June 1999 and August 2000, the effects of feeding medicated urea-molasses supplement blocks on the growth of dairy heifers in a marginal area of central Kenya were assessed by comparing the live-weight gain of supplemented and unsupplemented heifers grazing the same pasture. Thirty-nine heifers with an average age of 9.6 months were initially treated orally with albendazole (10 mg/kg bo...

The uterine histotroph provides essential nutrition to the developing conceptus during the preimplantation period of pregnancy. The objective of the present study was to examine the effects of cycle stage and progesterone (P4) concentrations in the blood on the recoverable quantities of amino acids and glucose in the histotroph during the preimplantaion period of conceptus development. Followin...

Twelve ruminally, duodenally, and ileally-cannulated Hereford heifers (average initial BW 313 +/- 20 kg) were used in a replicated experiment to evaluate dairy food processing wash water solids (WWS) as a protein source. Heifers were fed 2.8 kg of chopped (7.6 cm) hay and one of three supplements (1.5 kg/d, DM basis). Supplements were formulated to be similar in energy and contained 1.0 (contro...

BACKGROUND Neospora caninum is considered one of the major causes of repeated abortions in livestock. This study aimed to determine the seropositivity to N. caninum using indirect ELISA and the influence of the infection on the occurrence of abortions in selected dairy herd in Slovakia. METHOD Blood samples were obtained from 490 cattle over a period of two years and were tested for N. caninu...

Intrauterine and intramuscular administration of interferon was tested for effectiveness in extending luteal lifespan in cattle. Intrauterine infusion of 1 mg of recombinant bovine interferon-alpha I1, twice daily, to lactating dairy cows from d 14 to 21 after estrus extended interestrous interval (30.4 +/- 1.91 d versus 24.8 +/- .58 d) and functional lifespan of the corpus luteum (28.4 +/- 2.0...