论文开题，求文献6篇，先行谢谢了！！！

58062782

1、 Improvement Strategies in Ovine Artificial Insemination
; c  f. R8 h/ D- \) N3 G/ Chttp://www.ncbi.nlm.nih.gov/pubmed; V3 H+ h: Q, m7 C$ P: V7 z
2、 Factors influencing the success of vaginal and laparoscopic artificial insemination in churra ewes: a field assay3 T7 p- [3 G  w0 E) G
http://www.theriojournal.com/article/S0093-691X(04)00187-6/abstract
  F$ h5 j* E( f% x1 t9 k; \0 M9 A3、 Synchronization of ovulation and fixed time intrauterine insemination in ewes.
  o: g/ y2 B% d! Z2 K2 n! Xhttp://onlinelibrary.wiley.com/doi/10.1111/j.1439-0531.2004.00534.x/full( F/ T3 y! n0 O  T
4、 Laparoscopical intrauterine insemination with different doses of fresh, conserved, and frozen semen for the production of ovine zygotes.6 F% {8 D! k8 a# q) C
http://www.ncbi.nlm.nih.gov/pubmed/12832025+ u. {& a/ i5 I# A" w' Z
5、 Laparoscopic intrauterine insemination in Barbary sheep (Ammotragus lervia).
) V7 j& x$ r% A" Thttp://www.ncbi.nlm.nih.gov/pubmed/110983895 R) W9 O# i  L) n5 Y& w0 Y9 H
6、 Effect of mating system, flushing procedure, progesterone dose and donor ewe age on the yield and quality of embryos within a MOET program in sheep.9 s: x( T) d3 ^/ ]- O, c2 f
http://www.ncbi.nlm.nih.gov/pubmed/10735039
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58062782

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) F, a& a# [2 B  z谢谢！好运常伴！