The result will be presented when the final option is selected. A complete cycle averages 20 days in heifers and 21 days in cows (ranging from 17 to 24 days from the start of one heat period to the start of the next, if the animal does not become pregnant). By accessing or using the Site, you agree to be bound by the terms and conditions below. The estrous cycle in cattle is complex and regulated by several hormones and organs (see Figure 1). Generally, younger cows and smaller breeds calve up to 10 days earlier and older cows and larger breeds calve up to 10 days later. For most applications, 10 slices is sufficient to obtain a good estimate of primary drying time and maximum product temperature. Estrous cycle The estrous cycle in cattle consists of a series of events that keep recurring in definite order. The LyoModelling Calculator determines the heat and mass transfer at steady state in each of a number of slices into which the frozen solution can be divided. Estrous, on the other hand, is the whole reproductive heat cycle that a female goes through, from heat period to no heat period (Proestrus, Estrus, Metestrus, and Diestrus). Note: E 2 = estrogen and P 4 = progesterone. Set the options below to best represent your cattle. The HLI Threshold calculator is a simple tool to allow you to assess your animals quickly, without having to undertake a full RAP. Each cycle consists of a long luteal phase (days 1-17) where the cycle is under the influence of progesterone and a shorter follicular phase (days 18-21) where the cycle is under the influence of estrogen. Please read this agreement carefully before accessing or using the information and services available through the Cattle Heat Load Toolbox – CHLT website (“Site”). Calculation based on a 283 day gestation period. CHLT is powered by Weather Intelligence (WI) Pty Ltd, a Katestone Pty Ltd company. This is when she is “on heat”. Figure 1 —Phases of the bovine estrous cycle. This time of peak estrogen secretion can last from 6 to 24 hours, with ovulation occurring 24 to 32 hours after the beginning of estrus. Each cycle, or oestrus, lasts an average of 21 days; though in the height of summer the cycle can shorten to 18 days. Estrus is defined as the period where a female (in this case, a cow or heifer) is receptive to a male (or, the bull). During each oestrus cycle, the mare will be unreceptive for 16 days (known as dioestrus), and then accept the stallion for the last 4-5 days. The cycle begins with standing heat, or estrus. Catches every cow in heat, recording the date, time and duration of every mount . The HLI Threshold calculator is based on the same HLI adjustment factors as those used in the RAP. Saves time, labor, semen, and money ... continuously monitor all mounting activity of your cattle and transmit the mounting data (cow I.D., date of mount, time of day of the mount & duration of the mount) to your computer where advanced software algorithms examine the mounting profile of each animal.

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