Last edited by Nebei
Tuesday, May 12, 2020 | History

2 edition of Maximizing Conception Rate in Dairy Cattle. found in the catalog.

Maximizing Conception Rate in Dairy Cattle.

Ontario. Dept. of Agriculture and Food.

Maximizing Conception Rate in Dairy Cattle.

by Ontario. Dept. of Agriculture and Food.

  • 180 Want to read
  • 35 Currently reading

Published by s.n in S.l .
Written in English


Edition Notes

1

SeriesFactsheet (Ontario. Ministry of Agriculture and Food) -- Mcr-72
ID Numbers
Open LibraryOL21820058M

that conception rates were maximal when cows were inseminated between 6 and 24 hours before ovulation. This early work led to the establishment of the “a.m.­ p.m.” guideline suggests that cows in estrus during the be inseminated. Cows in milk 45% Dry cows 9% Pregnant heifers 8% Heifers (weaning to first service) 14% Heifers (birth to weaning) 24%. TOMORROW WE LOOK EMBRYO TRANSFER IN DAIRY COWS. To get a complete e-book manual on successful dairy farming, Kindly pay ksh via mpesa and text your email to the same number.

pregnancy rate for that day period is 10÷40 or 25%. Pregnancy rate can also be calculated by multiplying the percentage of cows detected in heat times the conception rate. In the previous example, the percentage of cows detected in heat is (20÷40) x = 50%, and the conception rate is (10÷20) x = 50%. Therefore, the pregnancy rate File Size: 26KB. Long post-partum intervals can affect conception rates two ways: 1) lack of estrual activity prevents any chance of conception occurring, 2) cows will be bred on their first post-partum estrus which often slightly reduces conception rate. 2 Beef Cattle Handbook Table of Calf Produced per Cow in the Herd Weaning Percent of Cows Weaning File Size: KB.

For example: if 95% of the herd is in heat in a day period, 95% of these heats are fertile, and 95% of the cows are serviced by the bull when in heat, the result is not a 95% conception rate. The conception rate during that day period is 86% XX). If an AI system is in place, several more factors are involved.   To achieve a high pregnancy rate, target for a goal of at least 65% service rate and 35% conception rate. Another good goal would be to cull less than 5% of the total herd for reproductive reasons. Achieving good reproduction is an attainable goal for all dairy farmers.


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Maximizing Conception Rate in Dairy Cattle by Ontario. Dept. of Agriculture and Food. Download PDF EPUB FB2

In the first four examples, holding heat detection rate constant at 60%, conception rates are varied from 30 to 60% (low to high). The resulting pregnancy rates range from 18 to 36%, or in other words, 18 to 36% of the cows detected in heat and inseminated became pregnant during each day period.

A breeding experiment with dairy cows and heifers of the Jersey, Guernsey, Ayrshire, and Holstein breeds was conducted in the University of Nebraska dairy herd. The females were given artificial services at various stages of estrus to determine the effect of time of service upon conception.

The results obtained indicate the potential benefits in higher percentage of conception Cited by: (age, stocking rate, libido, etc.) out of the breeding equation, we still have to recognize that differences in fertility exist among AI sires.

Because of the extensive recordkeeping systems in the dairy industry, several AI companies routinely publish information regarding conception rates of available AI dairy Size: KB. Table 2 shows that there was a % increase in rate of conception for cows which displayed standing behavior at 12 h after they were first observed in estrus.

Only % of all breedings were associated with standing behavior at 12 by:   INTRODUCTION. Reproductive performance is crucially important to maintain profitability in the dairy industry [].Conception at the first service after calving is key to optimal reproductive performance in dairy cows [], although the percentage success of first service has been shown to range between % and % in previous studies [3,4].A Maximizing Conception Rate in Dairy Cattle.

book of first service conception Cited by: 1. Beef Cattle, Dairy Cattle, Livestock. There are several steps producers can take in spring to maximize artificial insemination pregnancy rates. Photo: Laura Rance. Artificial insemination (AI) offers cattle producers the opportunity to use semen from high-accuracy, genetically superior sires at a fraction of the cost of purchasing a herd bull.

Getting cows pregnant in a timely manner is important in maintaining a profitable dairy business. Let’s look at the factors influencing conception rates in dairy cattle and tools available to rank bulls on fertility. Improvement in many traits of interest in dairy cattle.

The conception rate in lactating dairy cows declines with THI more than in cattle [11,12] and 75 in buffalo. The significant (p≤) decline in the first service pregnancy rate of dairy cattle was observed at THI level above 72 [ 14 ] and heat stress was one of the major factors for a significant reduction in a pregnancy rate of Cited by:   Nearly all published information has shown that Presynch + Ovsynch produced better A.I.

conception rates than using Ovsynch alone. This has been true when eit 12, or 14 days elapsed between the second Presynch injection and the onset of Ovsynch.

The gain is about 10 to 15 percentage : Jeff Stevenson, Kansas State University. All too often, dairy producers concentrate on conception rate (CR) and fail to recognize the economic value of pregnancy rate. So, what are the differences. CR can be mathematically expressed as the number of cows confirmed pregnant divided by the total number of cows inseminated.

So, if we breed cows and 35 are pregnant, our CR is 35 percent. bers to maximize the conception rate obtained with each sire; and (2) minimize differences in formance in dairy cattle have heightened awareness all aspects of bovine reproduction.

Many producers Conception rate- Using a “text book definition”, conception rate is basically synonymous with fertil-File Size: KB. Then multiply the Heat Detection Rate times the Conception Rate to calculate the Pregnancy Rate: HDR X CR = PR. For example, a herd with an HDR of 50 percent and a CR of 50 percent would have a percent PR, meaning that 25 percent of all the cows in the herd became pregnant in the first 21 days after breeding Size: 53KB.

Submission rate (3-week Sr) and 1st service Conception Rate (1st service Cr) The. correlation between 3-week and 6-week ICR was almost double the correlation involving 1st service CR (56% vs 29%). The average 6-week ICR among seasonally calving herds was 63 per cent and was associated with a three week SR of 77 per cent and a 1st service.

The genetic merit of a herd is a key determinant in productivity for dairy farmers. However, making breeding decisions to maximize the rate of genetic gain can be complex because there is no certainty about which cows will become pregnant with a heifer by: 4.

The findings of the study showed that cows inseminated with conventional semen had a mean conception rate of pc versus pc for cows inseminated with.

In line with the increased knowledge, the InCalf book for NZ dairy farmers 2 nd edition was released inthe InCalf training programme has been redeveloped and piloted in and now we have an updated Fertility Focus Report to share with the sector.

These and other studies show that conception rate is lower when cows are bred prior to midestrus or later than 6 hours after cessation of estrus (standing heat in this case). Maximal conception is obtained when cows are inseminated between midestrus and the end of standing estrus, with good results up to 6 hours after estrus.

Improving Fertility of the Cow Herd Posted Jun. 1, Although we hear a lot more about growth rate and beef quality and consistency these days, reproductive efficiency is easily the most important factor determining profitability of cow-calf operations. We will follow this with a discussion of factors controlling the expression of estrus by dairy cows and how to be more effective at detecting estrus.

We will highlight the critical need to time ovulation and insemination to maximize conception rates and will discuss some of the factors which reduce conception rates. Discount Rate is the expected annual return a dairy should get on money invested today.

It is usually slightly higher than the current interest rate. Cull Rate is the percent of cows that do not reach the next lactation. The defaults are. 45,, Most dairies cull between to per lactation. SenseHub™ is a sophisticated, modular cow monitoring solution that delivers actionable information on the reproductive, health, nutritional and wellbeing status of individual cows and groups.

With SenseHub, dairy farmers with any size operation, including large farms with over animals, can make data-driven decisions for maximized. This integrated project addresses the CSREES goal of enhancing economic opportunities for agricultural producers.

Preliminary data from our laboratory indicate that conception rates of dairy cows treated with Ovsynch could be increased from 26 to 50 %. This could increase farm profit $,/year on an cow dairy. The overall objectives of these.

Timely rebreeding of lactating dairy cows that fail to conceive to first AI service is essential for improving reproductive efficiency and profitability in a dairy herd. Because AI conception rates of high producing lactating dairy cows are reported to be 40% or less (Pursley et al., ; Fricke et al., ), 60% or more of lactating cows.