本文選題：背膘厚 + 繁殖性能��； 參考：《湖南農(nóng)業(yè)大學(xué)》2015年碩士論文

【摘要】：為了研究大白純種母豬在配種后的活體背膘厚與其當(dāng)胎的窩重、總產(chǎn)仔數(shù)以及產(chǎn)活仔的關(guān)系,通過統(tǒng)計421頭大白豬在配種后的前期、中期和后期的背膘厚,并跟蹤記錄其分娩后的出生窩重、總產(chǎn)仔數(shù)和產(chǎn)活仔數(shù),結(jié)果表明：隨著母豬懷孕時間的增加,其背膘厚也有一定程度的增加,通過背膘厚與其繁殖性能的方差分析,得知母豬配種后的背膘厚與繁殖性能之間的影響差異不顯著(P0.05),通過背膘厚與繁殖性能的相關(guān)分析,得知母豬配種后的背膘厚與窩重成正相關(guān),與總產(chǎn)仔數(shù)和產(chǎn)活仔數(shù)成負(fù)相關(guān),但是它們之間的相關(guān)不顯著(P0.05)。同時,對107頭正虹大白妊娠母豬進行了背膘厚跟蹤測定,從母豬配種日開始每隔一個月進行,由于部分母豬在妊娠期間返情、死亡等其它原因,最終52頭全程5次背膘厚測定,結(jié)果發(fā)現(xiàn)：母豬在懷孕60d-90d,其背膘厚增長速度顯著快于其它時間段(P0.05),說明妊娠母豬在該時間段對營養(yǎng)需求比較大。所以在生產(chǎn)過程中,飼養(yǎng)管理者在妊娠母豬該階段應(yīng)特別注意加強營養(yǎng)供給,保障母豬的營養(yǎng)需求。本試驗也對大白母豬哺乳期背膘損失與其下一胎繁殖性能進行了跟蹤測定,根據(jù)在哺乳階段背膘損失將母豬分成低(3mm)、中(3-6mm)、高(6mm)三組,發(fā)現(xiàn)其中背膘損失高的組(6mm),其下一胎的初生窩重、總產(chǎn)仔數(shù)、產(chǎn)活仔數(shù)及母豬淘汰死亡率均顯著差于其它兩個組,而其它兩組差別不顯著。這說明如果母豬在哺乳階段掉膘嚴(yán)重的話,將會嚴(yán)重影響對其下一次妊娠的繁殖性能；如果適當(dāng)?shù)舯觳惶?加強母豬在下一次妊娠階段的護理,則不會對其繁殖性能造成影響。
[Abstract]:In order to study the relationship between backfat thickness and litter weight, total litter size and live litter size of white purebred sows after breeding, the backfat thickness of 421 white pigs in the early, middle and late stages of breeding was calculated. The birth litter weight, total litter size and live litter size after delivery were recorded. The results showed that the backfat thickness increased to a certain extent with the increase of pregnant time of sows, and the variance analysis between backfat thickness and reproductive performance was carried out. It was found that there was no significant difference between backfat thickness and reproductive performance of sows after breeding. Through the correlation analysis between backfat thickness and reproductive performance, it was found that backfat thickness was positively correlated with litter weight, and negatively correlated with total litter size and live litter size. But the correlation between them was not significant (P 0.05). At the same time, the backfat thickness of 107 Zhenghong white pregnant sows was measured every other month from the day of sows breeding. Because some sows returned to the state during pregnancy, death and other reasons, 52 sows were measured backfat thickness 5 times in the whole course. The results showed that the growth rate of backfat thickness of sows at 60d-90 days was significantly faster than that of P0.05 in other periods, which indicated that the pregnant sows had a great demand for nutrition in this period. Therefore, in the process of production, breeding managers should pay special attention to strengthening nutrition supply in this stage of pregnancy sows to ensure the nutrition needs of sows. The backfat loss of large white sows during lactation and their reproductive performance were also measured. According to the backfat loss in lactation stage, the sows were divided into three groups: low backfat (3mm), middle backfat (3-6mm), and high backfat (6mm). It was found that the first litter weight, total litter size, live litter size and death rate of sows in the group with high backfat loss were significantly lower than those in the other two groups, but there was no significant difference between the other two groups. This indicates that if the sows lose fat seriously in the lactation stage, the reproductive performance of the next pregnancy will be seriously affected, and if the appropriate fat loss is not too high, the nursing care of the sows during the next pregnancy stage will not be affected.
【學(xué)位授予單位】：湖南農(nóng)業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：S828

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