Method for increasing daytime delivery proportion of purebred sows

Abstract

The invention relates to a method for increasing the daytime delivery ratio of purebred sows, which comprises the following steps of: 1, injecting 2mL of (+)-cloprostenol sodium injection into each sow at 8 a.m. in the morning before the expected delivery period of the purebred sows; step 2, injecting 1mL of carbetocin injection at 8 a.m. on the same day of the expected date of confinement of the purebred sows to promote the purebred sows to deliver in the daytime. The (+)-cloprostenol sodium injection is injected one day before the expected date of confinement of the purebred sow, so that the cervix uteri and the birth canal of the sow can be softened, the cervix uteri and the birth canal can be loosened and opened, and delivery can be started conveniently; the carbetocin injection is injected on the day of the expected delivery period of the purebred sows, the delivery process and the farrowing interval are shortened, the occurrence of postpartum hysteritis of the sows is reduced, and concentrated delivery is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of animal delivery, in particular to a method for increasing the daytime delivery ratio of purebred sows. Background Art

[0002] Due to sows' biological and behavioral characteristics, the vast majority of sows give birth naturally at night. Influenced by factors such as staff schedules, temperature, and visual clarity, nighttime farrowing often leads to delayed delivery and inadequate piglet care. This in turn leads to production problems such as prolonged farrowing, high rates of stillbirth, inflammation, and low seven-day rebreeding rates, resulting in significant economic losses for pig farms.

[0003] In order to allow purebred sows to give birth during the day, the traditional practice is to inject each sow with 0.2 mg of (+)-cloprostenol sodium at 8 a.m. the day before the due date of the purebred sow. According to the molecular formula C22H29CIO6, 0.2 mg is 2 ml. However, the proportion of sows giving birth during the day is not high, usually less than 50%. The stillbirth rate of sows is high, the labor process is long, and the weaning re-breeding rate is not high. See Table 1 below for details. Overall, the effect is not very obvious.

[0004] Therefore, controlling sow farrowing during the day is crucial to improving sow reproductive capacity. Summary of the Invention

[0005] Technical problem to be solved: In view of the shortcomings of the existing technology, the present invention provides a method for increasing the proportion of purebred sows giving birth during the day. The method can shorten the birthing process and the interval between farrowings, reduce the occurrence of postpartum metritis in sows, and concentrate birthing.

[0006] Technical solution: A method for increasing the daytime farrowing rate of purebred sows, the method comprises the following steps:

[0007] Step 1: At 8:00 a.m. on the day before the due date of purebred sows, inject each sow with 2 mL of (+)-cloprostenol sodium injection;

[0008] Step 2: Inject 1 mL of carbetocin injection at 8:00 a.m. on the day of the expected delivery of purebred sows to promote daytime delivery.

[0009] When the sows give birth, the temperature of the farrowing house is controlled at 18-25°C.

[0010] Beneficial effects: The method provided by the present invention for increasing the daytime farrowing ratio of purebred sows has the following beneficial effects:

[0011] 1. The present invention injects (+)-cloprostenol sodium injection into purebred sows one day before their due date, which helps soften the sow's cervix and birth canal, relax and open them, and facilitates the initiation of delivery.

[0012] 2. The present invention injects carbetocin injection on the day of the expected delivery date of purebred sows, which helps to shorten the delivery process and the interval between farrowings, reduce the occurrence of postpartum metritis in sows, and concentrate delivery. DETAILED DESCRIPTION

[0013] The (+)-cloprostenol sodium injection and carbetocin injection used below were purchased from Ningbo Sansheng Biotechnology Co., Ltd.

[0014] Example 1

[0015] An embodiment of the present invention provides a method for increasing the daytime farrowing rate of purebred sows, the method comprising the following steps:

[0016] Step 1: At 8:00 a.m. on the day before the due date of purebred sows, inject 2 mL of (+)-cloprostenol sodium injection into each sow according to the molecular formula C 22 H 29 0.2mg of ClO6 equals 2mL. (+)-Cloprostenol sodium softens the cervix and birth canal, relaxing and opening them to facilitate the initiation of labor.

[0017] Step 2: Inject 1 mL of carbetocin injection on the day of the expected delivery of purebred sows. The chemical name is desamino-2-oxy-methyltyrosine-1-κ oxytocin, also known as carbetocin, according to the molecular formula C 45 H 69 N 11 O 12 S is calculated as 35 μg per mL. Carbetocin is a long-acting nonapeptide synthetic analog of oxytocin. Carbetocin binds to the oxytocin receptor, shortening the labor process and farrowing interval, reducing the incidence of postpartum metritis in sows, and concentrating farrowing.

[0018] When the sows give birth, the temperature of the farrowing house should be controlled at 18-25℃.

[0019] Comparative Example 1

[0020] In this control group, only 2 mL of (+)-cloprostenol sodium injection was injected into each sow at 8:00 a.m. on the day before the due date of purebred sows, and no drug was injected on the due date of purebred sows.

[0021] The methods of Example 1 and Comparative Example 1 were applied to different pig farms, and the results were as follows.

[0022] 1. Practical Application①

[0023] In 2023, a trial comparison of new and traditional daytime farrowing technology was carried out in pig farms in the north and south, such as Xinmin, Zhehai, Hongyi, and Shunlong. The effectiveness of the new daytime farrowing technology was further verified through a large group data of 1,459 sows. The results showed that the new daytime farrowing technology can increase the daytime farrowing rate to more than 93%, reduce stillbirths by 0.38, and increase the weaning re-breeding rate by 5.96%. See Table 1 below for details.

[0024] Table 1

[0025]

[0026]

[0027] 2. Practical Application ②

[0028] From 2023 to 2024, the new daytime farrowing technology will be fully implemented across SMIC Seeds' affiliated pig farms. Based on preliminary comparative experimental results, the new daytime farrowing technology significantly improves sow health in the farrowing wards, increases weaning re-breeding rates, and ultimately enhances reproductive performance in the next parity. In the past year, sows using the new daytime farrowing technology farrowed 51,714 litters, resulting in an average increase of 1.13 piglets per litter and 0.71 live piglets per litter. See Table 2 for details.

[0029] Table 2

[0030]

[0031]

[0032] Economic benefit calculation: It can be seen from Table 3 below that in the past year (September 2023-August 2024), after Zhongxin Seed Industry used the new daytime farrowing technology, the number of live piglets weaned by Zhongxin Seed Industry increased by 38,463, the output of piglets increased by 15,001, and the output of small seedlings increased by 8,077. According to the contribution coefficient of the new daytime farrowing technology to output of 60%, in the past year, the proportion of piglets in Zhongxin's weaned live piglets was 65%, and the proportion of small seedlings was 35%. The selling price of piglets is 350 yuan, and the selling price of small seedlings is 1,800 yuan. The average annual economic benefit of Zhongxin Seed Industry's new daytime farrowing technology is 19.79 million yuan.

[0033] Table 3

[0034]

[0035] In summary, the method of the present invention can effectively shorten the labor process and farrowing interval, reduce the occurrence of postpartum metritis in sows, concentrate farrowing, and improve economic benefits.

[0036] The above is a detailed introduction to the embodiments of the present invention. For those skilled in the art, according to the ideas of the embodiments of the present invention, there may be changes in the specific implementation methods and application scopes. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A method for increasing the daytime farrowing ratio of purebred sows, characterized in that The steps of this method are as follows: Step 1: At 8:00 a.m. on the day before the due date of purebred sows, inject each sow with 2 mL of (+)-cloprostenol sodium injection; Step 2: Inject 1 mL of carbetocin injection at 8:00 a.m. on the day of the expected delivery of purebred sows to promote daytime delivery.

2. The method for increasing the daytime farrowing rate of purebred sows according to claim 1, characterized in that: When the sows give birth, the temperature of the farrowing house is controlled to be 18-25°C.

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