Defendant Purina Mills, Inc., appeals from a jury verdict in favor of plaintiff P.D. Kircher on a claim for breach of warranty. The issue on appeal is whether the plaintiff produced sufficient evidence to support the jury’s finding that defendant’s feed caused plaintiff’s damages. The court of appeals reversed and transfer was granted. The Court concludes that there is substantial evidence in the record to support the verdict. Affirmed.
The facts supporting the verdict are as follows: Plaintiff, P.D. Kircher was a dairy farmer in Cass County, who, since 1957, bred, raised and milked registered Holstein cows. In August 1984, Kircher began feeding his cows Purina Dairy Chow Complete XFB-16, which was manufactured by defendant Purina Mills, Inc. The feed was sold through defendant M.E. Buerge d/b/a East Lynne Elevator, but was delivered to Kircher’s farm directly from Purina’s Kansas City Mill.
A load of feed was delivered directly to the feed bins at Kircher’s farm on November 13,1984 about half of which was discolored, odd shaped, hard as if burned, with an off-odor and an off-taste. After consuming the feed for two or three days, Kircher’s cows appeared gaunt, acted nervous and refused to eat. On November 29, 1984, Dr. James Wright, D.Y.M., Kircher’s veterinarian, visited the farm and upon entering the milk house noticed a ketone odor.1 Dr. Wright observed that the cows were standing around looking rather gaunt. He also noticed that the cows refused to eat and had loose stool and diarrhea. The cows suffered from enteritis, an upset in the digestive tract, from ketosis, and from an increased incidence of uterine infections. Milk production declined and some cows had subsequent breeding problems.
When health and reproduction problems continued into 1985, Kircher decided to sell his herd. A dispersal sale of all cows was held on May 24, 1986.
On October 26,1987, Kircher filed a third amended petition against Purina and Buerge for breach of an express or an implied warranty of fitness for consumption. He alleged that the consumption of the bad feed caused damages to his herd. These damages included (1) the value of lost milk production; (2) the value of lost calves resulting from the inability to impregnate the cows; (3) the value of semen straws expended on unsuccessful impregnation attempts; (4) additional veterinary expenses; (5) additional labor expenses; and (6) the reduction in the value of the cows.
At trial, Purina’s motions for directed verdict at the close of plaintiff’s evidence and at the close of all the evidence were denied. A jury found in favor of Kircher and against Purina for $283,427.88. The jury also found against defendant Buerge but awarded no damages. Only defendant Purina appeals.
In reviewing a challenge to the sufficiency of plaintiff’s evidence, the Court views the evidence in the light most favorable to the plaintiff, giving the plaintiff the benefit *117of all reasonable inferences and disregards defendant’s evidence unless favorable to the plaintiff. Hoover’s Dairy, Inc. v. Mid-America Dairymen, Inc., 700 S.W.2d 426, 434 (Mo.banc 1985); Green v. Ralston Purina Company, 376 S.W.2d 119, 124 (Mo.1964).
The only issue on appeal is whether the plaintiff established causation by substantial evidence. To establish causation in this case the plaintiff was required to present substantial evidence from which a jury could conclude that the injuries to the cows and damages to the plaintiff resulted from the ingestion of defendant’s feed. Green, 376 S.W.2d at 123-24; Swanson v. Godwin, 327 S.W.2d 903, 910 (Mo.1959). Evidence of causation must be based on probative facts not on mere speculation or conjecture but plaintiff is not required to exclude all other possible causes or to prove an absolutely positive causal connection. Green, 376 S.W.2d at 123-24; Swanson, 327 S.W.2d at 910; Stevens v. Raney, 520 S.W.2d 615, 618 (Mo.App.1975); Joiner v. Kurt’s Chip-A-Way Park, Inc., 510 S.W.2d 773, 775 (Mo.App.1974). A prima facie case of causation is made where the evidence is susceptible to a reasonable inference that injuries to the cows resulted from eating the unwholesome feed. Green, 376 S.W.2d at 123-24; Watt v. St. Louis Public Service Company, 354 S.W.2d 889, 891 (Mo.1962).
Purina cites Missouri Farmers Association v. Kempker, 726 S.W.2d 723 (Mo. banc 1987), for the proposition that the plaintiff must present evidence excluding all possible causes of the cows injuries beside the feed. Kempker, discussing causation only to determine the admissibility of damages evidence, mentions that plaintiff's evidence fails to exclude other possible causative factors. Id. at 726. This reference was made in the context of noting that the plaintiff failed to produce substantial evidence establishing that defendant’s product caused plaintiff’s damages. An examination of Kane v. Chicago, Burlington & Quincy Railroad Company, 271 S.W.2d 518 (Mo.1954), cert. denied, 348 U.S. 943, 75 S.Ct. 365, 99 L.Ed. 738 (1955), relied on by the Court in Kempker, makes it clear that Kempker does not require plaintiffs to exclude every causative factor, save that for which the defendant is liable. Kane states:
The burden of establishing by substantial evidence the necessary causal connection between such negligence and the injury alleged rested upon respondent. And, if the evidence merely established that the injury might have resulted from several causes for some but not all of which appellants were liable, the necessary causal connection remained in the realm of conjecture and speculation and respondent’s case failed.
Id. at 521 (quoting Pedigo v. Roseberry, 340 Mo. 724, 102 S.W.2d 600, 608 (Mo.1937). Kane only requires a plaintiff to exclude other causes by presenting substantial evidence that a particular cause for which defendant is liable is responsible for plaintiff's injuries or damages. Such evidence establishes that the injury or damage is not merely the result of several equally probable causes.
Kircher’s veterinarian Dr. James Wright testified that the Purina feed caused ketosis, enteritis and increased incidents of uterine infections in the cows. These illnesses, according to Wright, were herdwide. Wright also stated that he saw evidence of decreased milk production and increased difficulties in successfully impregnating the cows; problems which, in his opinion, were also caused by the feed. Based on his personal observations, Wright concluded that the percentage of conceptions in the herd worsened as a result of the feed incident. Wright testified that he researched other possible causes for these conditions, but ruled out everything but the feed; that in his opinion “it definitely was the feed.”
The testimony of plaintiff's expert Dr. Wright, based on his examination and treatment of the cows, constitutes substantial evidence of causation.2 Kimmie v. *118Terminal Railroad Association of St. Louis, 334 Mo. 596, 66 S.W.2d 561, 564 (Mo.1933). Dr. Wright established a causal connection between the Purina feed and the sickness in the herd. He also linked the feed to some damages suffered by the plaintiff. The veterinarian testified as to some decrease in milk production and to some reproductive difficulties. It is reasonable to infer that these reproductive problems resulted in a decrease in the birth of calves and in a decrease in the market value of some of the cows, since cows that do not reproduce are useless as milk cows. The extent of the damages awarded has not been challenged on appeal. Because there is substantial evidence in the record of a causal connection between defendant’s feed and plaintiff’s loss, the trial court properly denied defendant’s motion for a directed verdict.
The judgment is affirmed.
HIGGINS, J., GREENE and CROW, Special Judges, concur. BLACKMAR, C.J., concurs in separate opinion filed. ROBERTSON and RENDLEN, JJ., concur and concur in separate concurring opinion of BLACKMAR, C.J. WELLIVER and COVINGTON, JJ., not sitting.. Ketone bodies are produced when the cows’ metabolism is off and they start drawing on the fats in their bodies for nourishment.
. In formulating his opinion, Dr. Wright did not use the term "reasonable medical certainty”. Use of this phrase, however, is not mandated and does not affect the substantiality of his *118testimony. Schiles v. Schaefer, 710 S.W.2d 254, 262 (Mo.App.1986); Miller v. Weber, 688 S.W.2d 389, 391 (Mo.App.1985).