Influence of Restricted Suckling on Uterine Involution in Beef Cows Yoshiaki IZAIKE, Akira OKANO*, Osamu SUZUKI, Kazuhiro SHIMADA, Motoaki KOSUGIYAMA,

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1 Influence of Restricted Sucklg on Utere Involution Beef Cows Yoshiaki IZAIKE, Akira OKANO*, Osamu SUZUKI, Kazuhiro SHIMADA, Motoaki KOSUGIYAMA, Takao OISHI* Department of Animal Industry, Chugoku National Agricultural Experiment Station, Ohda-shi, Shimane 694 *National Institute of Animal Industry, Tsukuba-Nordanchi, P.O. Box 5, Ibaraki 305 (Accepted for publication December 28, 1988) Summary. effects of restricted twice a day from 3 days after calvg were vestigated for the utere volution beef utere volution examed by rectal palpation were slower restricted cows than tact In the uteri taken out at 30 days postpartum, utere weight, diameter of middle part of post gravid length of post gravid were larger restricted cows than those of Thickness of myometrium restricted cows were th, while the cross-sectional area of utere lumen were larger than those of average height of surface epithelium of endometrium ovarian quiescence cows of restricted groups varied from 14.1 to 23.2 gm, but one of the restricted cows which had first ovulation at 24 days postpartum showed 28.2 to 35.2 ƒêm. It is concluded that the restricted twice a day hibit the morphological volution of uterus compared with the However, the height of surface epithelium of endometrium are fluenced by ovarian function regardless of utere volution. KEY WORDS; RESTRICTED SUCKLING, UTERINE INVOLUTION, HISTOLOGY, BEEF COW. Jpn J Anim Reprod 35, 38-44, 1989

2 Table I. Milk yield, number of events total time at various postpartum days restricted cows of Japanese Polled breed

が回帰し,24日目に初回排卵したその他の牛は,卵胞非妊角(D):Y=-36.21+67.39lnX の発育が認められるものの排卵にまで至らず,発情も回帰しなかった 30日目に摘出した卵巣の状態は,1号において18 22mmの黄体と直径15mmの (R2=0.

3 が回帰し,24日目に初回排卵したその他の牛は,卵胞非妊角(D):Y= lnX の発育が認められるものの排卵にまで至らず,発情も回帰しなかった 30日目に摘出した卵巣の状態は,1号において18 22mmの黄体と直径15mmの (R2=0.996) 卵胞が形成されていたその他の牛には,直径10 16mmのが1 3個'形 (lnX)2十4,01(lnX)3 牛得られた回帰式の寄与率(R2)は0, と卵胞好なあてはまりを示した Fig.1にすように,すでに分娩後8日成されていたなり良その回帰曲線を示目において,妊角と非妊角分娩後の子宮修復の進行の子宮角幅は自然哺乳牛に比べ制限哺乳牛の方が大きか分娩後の子宮修復の推移は両試験区の妊角,非妊角にったその後の子宮修復の進行も,自然哺乳牛に比べてついてそれぞれ以下に示すような式が得られた制限哺乳牛は緩慢に推移した分娩後30日目に摘出した子宮の修復状況は,制限哺乳制限哺乳牛妊牛(Fig.2)が角(A):Y=-3.15十23.18lnX-9.57(lnX) (lnX)3(R2=0.995) 比べて明らかに遅延であり,子宮表面は充血の程度が著しかった自然哺乳非妊角(B):Y= lnX 牛の子宮表面の充血の程度は軽度であった (lnX)2十3.30(lnX)3 子宮頸管,子宮,卵巣の測定値をTable2に (R2=0,995) 示した子宮頸管および子宮重量,妊角の子宮角中央部の直径, 自然哺乳牛妊自然哺乳牛(Fig.3)にしていた制限哺乳牛の子宮は妊角と非妊角の差が明瞭妊娠子宮角の長さはいずれも制限哺乳牛で大きかった角(C):Y=-53.22十83.11lnX-33.33(lnX) (lnX)3(R2=O0.994) 制限哺乳牛と自然哺乳牛の非妊角の子宮角の直径と子宮角の長さは,ほぼ等しい値であった一方,妊角の子宮筋層の厚さは自然哺乳牛に比べて制限哺乳牛の方が薄かった制限哺乳牛における子宮腔には,Fig.4に Fig. 1. Progress of utere A: Post gravid B: Post non-gravid volution restricted restricted restricted Fig. 2. Post gravid D: Post non-gravid uterus restricted beef cows at 30 days postpartum. Post gravid (right) is clear, the surface of uterus is considerably COWS. C: 示すよ congested. 40 centimeters.

4 Fig. 3. uterus normal at 30 clays postpartum. almost complete. utere beef volution cows Fig. 4. cross section of utere lumen restricted large exped cave of utere lumen is observed. 1 is centimeters. centimeter. Table 2. weight size of cervix, cows at 30 days postpartum uterus 41 ovary restricted

Table cows 3. at Height of surface 30 postpartum days Fig. 5. endometrium at 30 days the cow with the first ovulation postpartum. surface epithelium epithelium postpartum at 24 days is thick.

5 Table cows 3. at Height of surface 30 postpartum days Fig. 5. endometrium at 30 days the cow with the first ovulation postpartum. surface epithelium epithelium postpartum at 24 days is thick. restricted Fig. 6. the surface cow endometrium with no epithelium at 30 experience is th. days of postpartum ovulation. 50 ƒêm. 50 ƒêm. うな空洞が認められる個体もあったが,自然哺乳牛には子宮小丘間部位の方がいずれも高い傾向にあったしかいずれも空洞は存在しなかった妊角子宮腔の断面積はし,そ制限哺乳牛の方が大きかった卵巣重量は,両者に明確 (子宮摘出前7日)にな違いを認めなかった 35.2μmで子宮内膜表面上皮の高さはTable3に示すように, の高さはFig.5にも示すように,分あったのに対し,初た制限哺乳と自然哺乳の2 6号 μmと妊角よりも非妊角の方が,また,子宮小丘部位に比べて 42 娩後24日目初回排卵した1号牛が平均28.2 回排卵にまで至らなかっ牛(Fig.6)は,平有意に低かった均

Casida LE (1968) Studies on the postpartum Wiscons Res Bull 270: 48-51. Gier HT, Marion GB (1968) Uterus of the cow after parturition: Involutional changes. Amer J Vet Res 29: 83-96.

6 Casida LE (1968) Studies on the postpartum Wiscons Res Bull 270: Gier HT, Marion GB (1968) Uterus of the cow after parturition: Involutional changes. Amer J Vet Res 29: Izaike Y, Okano A, Shimada K, Oishi T (1985) Effects of on the terval from calvg to utere volution beef Jpn J Anim Reprod 31: Izaike Y, Okano A, Shimada K, Oishi T (1986) Effects of early weang on postpartum ovarian activity utere volution beef Bull Chugoku Nat Agr Exp Stn Series B 29: 9-16 ( Japanese). Izaike Y, Suzuki O, Okano A, Shimada K, Oishi T, Kosugiyama M (1989) Influences of parity, milk yield stimulation on utere volution beef Jpn J Anim Reprod 35: ( Japanese). Mochow R, Olds D (1966) Effect of age number of calvgs on histological characteristics of the bove uterus. J Dairy Sci 49: Okamura T, Shoda T, Ishikawa Y, Munetsuna Y (1986) Efficiency of grazg the pasture of Japanese black cattle polled Japanese digenous cattle. Bull Zoot Exp Stn Yamaguchi Jap 5: ( Japanese). Gkano A, Fukuhara R (1980) Histological studies on postparatal utere volution Japanese black Jpn J Zootech Sci 51:

7 Okano A, Fukuhara R, Shioya Y, Obata T (1981) Morphological volution of postparatal uterus Japanese black Bull Chugoku Nat Agr Exp Stn Series B 25: 1-10 ( Japanese). UriaMarov MS, Lovell JE (1968) Cytology of the bove epithelium durg the estrous cycle. Am J Vet Res 29: Usmani RH, Ulla UN, Shah SK (1985) A note on the effect of stimulus on utere volution, postpartum ovarian activity fertility NiLi- Ravi buffaloes. Anim Prod 41:

106(18) 原使用した測定部位は期門穴相当部位の表皮上及び真皮下とし, 表皮上では艾柱の直下に熱電対先端を露出し固定した真皮下では施灸部より10mm 下方を切開剥離し, 施灸部直

106(18) 原使用した測定部位は期門穴相当部位の表皮上及び真皮下とし, 表皮上では艾柱の直下に熱電対先端を露出し固定した真皮下では施灸部より10mm 下方を切開剥離し, 施灸部直 106(18) 原使用した測定部位は期門穴相当部位の表皮上及び真皮下とし, 表皮上では艾柱の直下に熱電対先端を露出し固定した真皮下では施灸部より10mm 下方を切開剥離し, 施灸部直下に熱電対先端が届くように挿入した熱電対の出力は温度モジュ