[{
  "type": "article-journal",
  "title": "FERTILITY OF LACTATING JERSEY X HOLSTEIN-FRIESIAN COWS IN SUBTROPICAL REGION SUBMITTED TO A DOUBLE-OVSYNCH VERSUS OVSYNCH PROTOCOL FOR TIMED ARTIFICIAL INSEMINATION",
  "author": [
    {
      "family": "Channa",
      "given": ""
    },
    {
      "family": "Aleem",
      "given": ""
    },
    {
      "family": "Jabbar",
      "given": ""
    },
    {
      "family": "Monir",
      "given": ""
    },
    {
      "family": "Ahmad1",
      "given": ""
    }
  ],
  "issued": {
    "date-parts": [[2020]]
  },
  "container-title": "Journal of Animal and Plant Sciences",
  "ISSN": "1018-7081",
  "volume": "30",
  "issue": "1",
  "page": "255-258",
  "DOI": "https://doi.org/10.36899/JAPS.2020.1.0030",
  "abstract": "<p>Pre-synchronization prior to Ovsynch protocol is an efficient method to improve ovulation and pregnancy rate in dairy cows. The objective of this study was to define the effect of Double-Ovsynch (DOS; GnRH, PGF2&alpha; 7 d later and GnRH 2 d later followed by the OVS protocol with interval of 7 d; timed AI 16 to 24 h after the last GnRH of OVS) and Ovsynch (OVS; GnRH, PGF2&alpha; 7 d later and GnRH 2 d later; timed AI 16- 24 h after the last GnRH) protocols on ovulation and pregnancy rate in crossbred dairy cows. The ovulation rate (day 7 post TAI, DOS<em>&nbsp;n</em>&nbsp;= 20 vs. OVS&nbsp;<em>n&nbsp;</em>= 21) and pregnancy rate (day 35 post TAI, DOS<em>&nbsp;n</em>&nbsp;= 125 vs. OVS&nbsp;<em>n&nbsp;</em>= 148) were determined using ultrasonography. Serum concentrations of progesterone on d 7 after the last GnRH of each protocol was determined in the subset of randomly selected cows (DOS&nbsp;<em>n</em>&nbsp;= 10) and (OVS&nbsp;<em>n</em> =10) protocol. The Ovulation rate (OR) was higher (P &lt; 0.05) in DOS as compared to OVS (90% vs. 47%) protocols. Likewise, pregnancies per AI (P/AI) significantly (P&lt;0.05) increased in DOS as compared to OVS (62 % vs. 30%). Mean serum concentrations of progesterone on d 7 remained similar (P &gt; 0.05) between DOS and OVS (8.68 &plusmn; 0.78 ng/mL: 8.19 &plusmn; 1.85 ng/mL)protocols. It is concluded that DOS compared to OVS yields better ovulation and pregnancy rate in crossbred dairy cows.</p>",
  "publisher": "Pakistan Agricultural Scientists Forum",
  "URL": "https://thejaps.org.pk/AbstractView.aspx?mid=AS-18-0055"
}]